Mental Health Dynamics of Interfaith Spirituality in Believers and Non-Believers: The Two Circuit Pathways Model of Coping with Adversities: Interfaith Spirituality and Will-to Exist, Live and Survive

Objective: The study was designed to examine the differential effects of spirituality on the mental health of believers and non-believers coping with adversities. Method: Spirituality, “will-to-exist-live-and-survive (WTELS)”, cumulative traumas, perceived posttraumatic growth, psychopathology, existential anxieties, self-esteem, and reappraisal were measured in two samples of main believers (Egypt, Turkey, and Kuwait, N = 1210) and mostly non- believers (UK, N = 178). The study used path analysis supplemented by PROCESS macro and multigroup invariance to analyze the data. Results： identified two positive invariant coping paths for believers, one through WTELS and the other through spirituality. A similar positive path of WTELS, but not spirituality, was found in the non-believers. Conclusion: While believers and non-believers utilize their WTELS pathway to cope with adversities, the believers utilize the additional pathway of spirituality. The non- believers still utilize self-transcendence strategies of non-theistic or secular spirituality. The results have conceptual and clinical implications for developing differential prevention and intervention strategies.


Introduction
Coping with adversities may have different pathways in those who believe in a higher power, and those who may not believe. The differences between those who do not believe in a higher power, and the believers in their coping strategies with adversities, never have been studied. The goal is to fill some of these gaps in the literature by identifying the differential coping strategies for each group which helps individualize interventions as well as developing transdiagnostic strategies for those potentially shared coping strategies.
Striving to make sense of the meaning and purpose of a person's life project and existence is often experienced in tandem with severe and serious adversities and threats to personal or collective identities (e.g., terminal illness, oppression, Holocaust, and genocides). People who experience existential threats encounter a crisis of the meaning and purpose of life and existence. They may experience existential anxieties about the future of their survival (Davis et al, 2003;Frankl, 2000). Existential turmoil and spiritual crisis may lead either to spiritual struggle (Exline & Rose, 2013) or spiritual growth (or both). Spirituality usually emerges as one outcome of this process. However, these dynamics may differ between believers and non-believers in a higher power. The differences in these dynamics between believers and non-believers (e.g., atheists) are poorly understood.
The model of value processing explains how cumulative adversities lead to post-traumatic growth (PTG). Cumulative adversities lead to increased cognitive dissonance, self-discrepancy, and existential anxieties. Cognitive dissonance and existential anxieties lead to initial automatic appraisal, followed by deliberate conscious reappraisal. Deliberate reappraisal leads to a recalibration of the person's belief and value processing system, followed by positive self-evaluation and improved mental health and PTG. WTELS is the core executive that motivates and operates this process (see Figure 1).
Exposure to cumulative life stressors and traumas (CST) are important parts of development and growing up emotionally and spiritually (Kira et al., 2013b).
Perceived posttraumatic growth (PTG) (Tedeschi & Calhoun, 1996) is associated with trauma, suffering, and PTSD non-linearly (Kanaan et al., 2019;Kira et al., 2013a). Severe CST that threatened the existence of one of the individual's personal, collective, status or physical identities and triggers existential annihilation anxieties (Kira et al., 2012c;Kira et al., 2019b), may lead to psychopathology, PTSD, and poor physical health. However, executive will to exist, live and survive (WTELS), a novel construct was recently introduced in the literature (Kira, et al., 2014a;Figure 1. Trajectory chain of value processing of stressors and traumas and the pathway to postraumatic growth. Kira et al., 2020a), along with self-esteem (positive self-evaluation) and emotion regulation strategies (e.g., reappraisal) and interfaith spirituality (Kira et al., 2019c) may be effective buffers against such existential anxieties to prevent the eruption of psychopathology and may lead further even to perceived posttraumatic growth (PTG). WTELS is the intrinsic, innate motivation or metamotivation to exist, live, survive, self-actualize, and succeed/thrive (Kira et al., 2020a). WTELS propels and manages goal-directed activities and their hierarchy of motivational architecture in different challenges and life projects. WTELS is an existential feature that is part of the person's agentic executive self (Kira et al., 2014a). WTELS, a non-cognitive (or pre-cognitive) factor, has cognitive, emotional, behavioral, and mental health consequences. WTELS is a powerful tool when it comes to the understanding of dynamics that are at the center stage in the science of motivation and coping with adversities. These dynamics include WTELS's role in mental and physical health, post-traumatic growth (PTG), resilience, seeking, and providing social support. The empirical research found compelling evidence that WTELS is strongly associated with PTG, resilience, and social support (Kira et al., 2020b). WTELS was found to be an effective coping strategy for severe prolonged and continuous traumas such as COVID-19 .
In this study, we will develop an inclusive model for interfaith spirituality; explore the dynamics behind the emergence and impact of interfaith spirituality that include the dynamics of meaning-making and self-transformation. We will explore the mechanism behind spirituality's positive effects on believers and the I. Kira et al. DOI: 10.4236/psych.2021.126060 995 Psychology mediation of self-esteem and emotion regulation. We discuss the role of spirituality, along with and "will to exist live and survive (WTELS)", in buffering existential anxieties and alleviating psychopathology, and promoting perceived posttraumatic growth (PTG). Further, we will develop and test a structural model for the relationship between interfaith spirituality, life adversities (cumulative trauma), WTELS, emotion regulation, self-evaluation (e.g., self-esteem), and different aspects of mental health and perceived posttraumatic growth (PTG) in believers and non-believers. While most of the previous studies tested spirituality in a specific faith, or one of its dimensions, and mental health in believers, they never tested this relationship in different faith believers and non-believers. The goal was to see the differential coping pathway utilized by those who believe in religious orientation and those who do not believe.
Interfaith spirituality (IFS) includes the personal heuristics that people, regardless of their different belief systems, who believe in the existence of a sacred creating force, use to make sense of human's finite existence, and cope with existence-threatening events (Kira et al., 2019c). The main tenets of interfaith spirituality (IFS) acknowledge the presence of a creating force regardless of its specific nature. IFS consists of basic components: closeness to creating power, asceticism, meditation, and divine love (Kira et al., 2019c). IFS found to contribute to the alleviation of existential turmoil, anxieties, and related spiritual struggle. Interfaith (theistic) spirituality, as contrasted by non-faith (non-theistic) or secular spirituality includes the personal heuristics and narratives that people of faith, regardless of their different belief systems, who believe in the existence of a sacred creating force, use to make sense of humans' finite existence and cope to existence-threatening events. These heuristics and narratives derive from beliefs in a sacred higher power c.f., e.g., (Emmons, 2005;Pargament, 1999) and the ability of self-transcendence e.g., (Koltko-Rivera, 2006;Levenson et al., 2005). While the belief in a sacred power does not exist in the non-believers' beliefs, self-transcendence heuristics, the second part of spirituality can be basic in nonbelievers' secular spirituality and beliefs (Kira et al., 2019c).
The focus of the current study on interfaith spirituality (IFS) does not mean that non-theistic or secular spirituality that may utilize more self-transcendence strategies has a less or more positive impact on mental health. Separating and studying both kinds will help clarify the dynamics of each. We assume that IFS will not have the same effects on non-believers, except for the self-transcendence strategies component (for example asceticism) that may reflect itself differently in non-believers, compared to the believers and that secular spirituality may have different or similar dynamics for non-believers

Conceptual Model of the Dynamics of Spirituality in Believers and Non-Believers
Interfaith spirituality, cumulative life adversities, and executive will to exist, live, and survive (WTELS) were identified as the interacting predicting variables that may lead to the emergence of two or three interacting causal chains or coping

Hypotheses
Hypothesis 1: Interfaith spirituality (IFS) is associated with reduced EAA, psychopathology, and predicts increased emotion regulation strategy of reappraisal, self-esteem, and perceived PTG, in believers regardless of their religious affiliations.
Hypothesis 2: Spirituality is associated with the agenetic WTELS in believers regardless of their religious affiliations.
Hypothesis 3: WTELS predicts lower EAA, psychopathology, and higher emotion regulation, self-esteem, and perceived PTG in believers and nonbelievers. In the Kuwaiti subsample (N = 300), the research team consisted of 4 doctoral students with a professor in Psychology as a supervisor and project leader. The team members have been trained in conducting research and interviewing. The sample design was a purposeful quota sample to represent different age groups, students, and communities (50% of students and 50% of community). The questionnaire was administered to college students using a group class administra-Psychology tion, while the community participants were interviewed personally.

Participants
We combined the three data sets from Egypt (N = 490), Turkey (N = 420), and Kuwait (N = 300). The combined sample (N = 1210) was used to test the proposed conceptual model for believers. Table 1 summarized the demographic characteristics of the combined sample and the sub-samples.

The Second Sample (The UK Sample N = 178)
Procedures Participants were recruited using two strategies. The first was using a crowdsourcing website "prolific.ac", where the participants received £2 for completing the survey. We specified in the settings that they have to be students or college-  (1) Not true about me. The instruction introduced a specific definition of spirituality as "the feeling of a direct relationship with your creator, and your ability to transcend yourself. With "Creator" means the power that put everything into existence, as you perceive it." Exploratory and confirmatory factor analysis validated its structure and found a second-order unitary construct of IFS. The measure was found to be strictly invariant across religions, genders, ages, and regional groups. IFS and its subscales were associated with religiosity, higher self-esteem, higher emotional regulation, higher will to exist live and survive, and posttraumatic growth. They were negatively associated with PTSD, depression, suicidality, externalizing, thought disorder, and psychopathology in general. Internal consistency α for the scale (23 items) was .92. Test-retest (4 weeks interval between time 1 and time 2) on a sample of (N = 34) found to be .72.
The "will to exist, live and survive (WTELS)" scale (Kira et al., 2020b;Kira, et al., 2020e). WTELS scale is a 6-item scale that measures different aspects of will to exist, live, survive, and thrive. It includes items such as "I am motivated by a drive to live"; "My will to exist and survive adversity is generally high." We scored each item on a 5-point scale: 4 = very strong, 3 = strong, 2 = neutral, 1 = drained/depleted, 0 = extremely depleted/I have no will to survive. Exploratory and confirmatory factor analyses found that the measure has a one-factor structure. The measure's one-factor structure was strictly invariant across gender, cultural, and religious groups. We should clarify that the WTELS scale is a short parsimonious measure, which did not allow robust testing of its three distinct unique components structure. WTELS construct is comprised of three distinct but overlapping components. A three-factor model was not established or tested because it was a short instrument consisting of only six items (a longer test allows at least four items per dimension).
Additionally, the study found that the measure's test-retest stability coefficient (4 weeks interval) on a sample (N = 34) to be .82. WTELS has good convergent, divergent, and predictive validity. WTELS predicted a decrease in existential anxiety, mental health symptoms, and an increase in emotion regulation (reappraisal), self-esteem, and posttraumatic growth (Kira et al., 2020e). The Cronbach's reliability of the scale in current data is .89.) Cumulative Stressors and Traumas Scale (CST-Short version) (Kira et al., 2008a) The Cumulative Stressors and Traumas Scale CST-S (short form) is a measure that was constructed based on the development-based trauma framework (DBTF) e.g., (Kira, 2001;Kira, 2021;Kira et al., 2013a;Kira et al., 2013b;Kira et al., 2008a;Kira et al., 2018a;Kira et al., 2020a). DBTF identifies different dimensions of individual development that may be affected by stressors and traumatic stressors (i.e., attachment, personal, collective, and role identities, and interdependence, as well as serious non-acute stressors). The CTS-S is a 32-item instrument that measures cumulative stressors and traumas and trauma types in terms of occurrence, frequency, and negative and positive appraisals. The scale is intended to be a comprehensive measure of cumulative stressors and traumatic exposures. Cumulative non-traumatic stressors included the serious life changes associated with widowed/divorce and re-marrying, as well as the major life changes in forced relocations (e.g., uprootedness and immigration), and the experience of seemingly small but recurrent or unremitting hassles or chronic stressors. The scale includes, in addition to cumulative non-traumatic stressors (3 items), seven major trauma types (acute stressors): collective identity trauma (3 items), personal identity trauma (6 items), survival trauma (6 items), attachment trauma (2 items), secondary trauma (7 items), achievement traumas (2 items) and gender discrimination (2 items). Recently, the scale developers added three items that measure: perpetration trauma, community violence, and birthing trauma (complicated birth) as optional items for interested researchers. Collective identity trauma includes trauma-related to exposure to war and torture and discrimination based on race, ethnicity, or national origin. Personal identity trauma includes trauma related to sexual abuse, rape, incest, and being robbed. Attachment trauma includes abandonment by parents. Survival trauma includes car accidents, life-threatening illnesses, and natural disasters. Achievement or role identity trauma is intended to measure traumatic stressors related to the achievement of life goals like success in school or business. Secondary trauma includes trauma related to having witnessed a traumatic event occurring to another individual or group and affecting social interdependence. Gender discrimination includes gender discrimination by parents (family) and gender dis-Psychology crimination by society and institutions. Gender discrimination items are worded to apply to both genders. In response to each item on the measure, participants are instructed to indicate their experience with a traumatic event on a 5-point Likert-type scale (0 = never; 4 = many times). If a participant denotes that she/he has experienced the traumatic event, then he/she is asked to describe her/his appraisal of its effect on a 7-point Likert-type scale (1 = extremely positive; 7 = extremely negative). CTS-S includes two general subscales for cumulative trauma dose: occurrence and frequency of experience, and two appraisal subscales: negative and positive appraisal of events. These four sub-scales may be also generated for each of the trauma types.
The CTS-S has shown adequate internal consistency α = .85; (Kira et al., 2008a;Kira et al., 2013c). Test-retest using an independent sample of 35 males with four weeks interval yielded excellent stability coefficients (.995 for cumulative trauma frequency, and .997 for cumulative trauma appraisal). The measure proved to have good predictive validity with cumulative stressors and traumas highly predicted psychopathology and suicidality (Kira et al., 2019a(Kira et al., , 2020a. Evidence of the instrument's predictive validity includes cumulative trauma significantly predicting post-traumatic stress disorder (r = .54, p < .001), cumulative trauma-related disorders (r = .24, p< .001), and poor health r = .37, p < .001 (Kira et al., 2008a). CTS-S has also shown divergent validity: It was significantly negatively correlated with sociocultural adjustment (r = −.25, p < .001) and futuristic orientation (r = −.37, p < .001). CTS-S has been used with a variety of clinical and community samples of adults and adolescents from numerous sociocultural groups and has been shown to possess adequate reliability (with an alpha ranging between .80 and .92), good construct validity e.g., (Kira et al., 2008a, Kira et al., 2012bKira et al., 2010;Kira et al., 2020c), and validity across different cultural and clinical groups, including American Indians, Mayans, Palestinians, Egyptians, refugees, and torture survivors from 32 countries e.g., (Kira et al., 2013d;Kira et al., 2013c;Kira et al., 2014c;Kira et al., 2010). The measure has been used in several studies as a comprehensive measure of stress and trauma e.g., (Eltan, 2019;Gillespie & Gates, 2013;Head et al., 2012;Millender, 2013;Omidy, 2012;Rizeq et al., 2018), and has been found to have good reliability and predictive validity. It has been translated into different languages including Arabic, Spanish, Polish, Korean, and Nigerian, and proved to have good psychometric properties in these languages. The alpha for the main scale of occurrence was .88 in believers and .90 in non-believers.
Mediating was found to be significantly associated with cumulative trauma, PTSD, depression, thought disorder, internalizing, externalizing and suicidality, poor reported physical health, gender, and other discriminations, and sexual abuse. It was negatively associated with "the will to exist, live and survive", spirituality, religiosity, self-esteem, and emotion-regulation .
The Rosenberg self-esteem scale (RSES) is a 10-item scale that measures global self-esteem (Rosenberg, 2015). Each item rated on a 4-point Likert-type scale with a range from strongly agrees to disagree strongly and scored from 0 to 3.
The scale is divided into five positively worded and five negatively worded state-  (Gross & John, 2003;John & Gross, 2004). The measure was previously scientifically translated into Arabic and found to have good psychometrics. In the current data, reappraisal has (α = .89), and suppression has (α = .78).
The religiosity scale is five items that had been used previously in similar populations e.g., (Al-Ibraheem et al., 2017). It contains items that measure the consistent practice of religion. It includes also items about congregating with persons from the same religion, reading the religion's Holy Book, and giving to religious charities. The measure had α = .70 in the present study.

Outcome or Dependent Variables Measures
Clinician-administered PTSD Scale CAPS-2 PTSD Measure (CAPS-2) (18 items). This scale was developed by (Blake et al., 1995). It is widely used to assess PTSD symptoms (DSM IV version). It is a structured clinical interview that evaluates 17 symptoms rated on frequency and severity on a 5-point scale. CAPS demonstrated high reliability with a range between .92 -.99 and showed good convergent and discriminant validity (Weathers et al., 2001). In this study, we used the frequency subscale of CAPS-2 that is currently widely used in the psychiatric literature and is highly correlated with the total scale. The scale in the  (Dennis et al., 2006) is a 20 items scale that measures the three factors of psychopathology: internalizing, externalizing, and or thought disorders e.g., (Caspi et al., 2014;Laceulle et al., 2015). The participant is asked to indicate if the behavior (or feeling) happened in the past month (scored 4), or happened in the last 2-3 months (scored 3), or in the last 3 -12 months (scored 2), or the last year or more (scored 1), or never happened (scored 0 Depression Single item measure (Chochinov et al., 1997): This single-item measure for depression was found to correctly identify eventual diagnostic outcome of every patient, outperforming questionnaire and visual analog measures.
The Post-Traumatic Growth Inventory (PTGI); (Tedeschi & Calhoun, 1996) assesses perceived positive life changes (e.g., enhanced relationships, greater life appreciation) following stressful experiences.  (Tedeschi & Calhoun, 1996) found the internal consistency (alpha) of the total PTGI to be .90 and the test-retest reliability coefficient to be .71. The measure also appears to have sound psychometric properties in the Arabic language version (Kira et al., 2012a;Kira et al., 2013a), with an alpha of .96 for the main measure. In the current data, the scale had an alpha of .90. Alpha coefficients ranged between .83 and .70 for its five subscales.

Statistical Analysis
The data were analyzed utilizing IBM-SPSS 22, as well as Amos 22 software. We Psychology compared the two samples in the main variables using an independent sample T-test. We conducted a zero-order correlation between the primary variables in each sample. We explored the differences between gender, age, regional and religious groups in Spirituality using the independent sample t-test and one way-ANOVA.
We conducted a path analysis to test the proposed conceptual model fit in each sample. The Path model included cumulative stress and traumas, Spirituality and will to live as independent variables and reappraisal, suppression (emotion regulation), and self-esteem as mediators/moderators variables, and PTSD and perceived PTG as outcome variables. We will report direct, indirect, and total effects as standardized regression coefficients. Following ( Additionally, for the first sample, to assess whether the structural path model is invariant across genders, religious affiliations (Christian and Muslims), and regions (Upper Egypt, Middle Egypt, and Cairo, Kuwait), we conducted multi-group invariance analysis (Sarstedt et al., 2011). Four nested models were tested sequentially: a configural invariance model, a metric invariance model, a scalar invariance model, and a strict invariance model e.g., (van de Schoot et al., 2012). Although there is broad acceptance of the steps for testing measurement invariance, the criteria for evaluating the invariance of the models at each level are not as clear. Chi-square tests LRT is highly sensitive to sample size e.g., (Meade & Lautenschlager, 2004), potentially leading to an excessively conservative test of invariance and is controversial to be used with large samples. (Byrne et al., 1989), have argued that invariance can be established when two indicators are invariant. According to (Chen, 2007), the null hypothesis of invariance should not be rejected when changes in CFI are less than or equal to .01 and in I. Kira et al. Psychology RMSEA are less than or equal to 0.015.

The Differences between the Two Samples
The participants in the first sample (mostly believers), as expected, are much higher in spirituality (t = 38.13) and religiosity (t = 23.25), and collective identity salience (t = 19.16). However, the participants in the second sample (mostly non-believer) have significantly higher "will to exist live and survive". The participants in the second sample who were mostly non-believers have higher cumulative stressors and traumas and consequently have higher internalizing, externalizing, and thought disorders and poor physical health, as well as lower, perceived PTG. There are no significant differences in emotional regulation strategies of reappraisal or suppression between them. Table 2 presents the details of these results.

Path Analysis and PROCESS Mediation Results for the First Sample
Interfaith spirituality had direct negative effects on existential annihilation anxiety (EAA) and direct positive effects on perceived posttraumatic growth (PTG). EAA had strong positive direct effects on Psychopathology and direct negative effects on self-esteem and reappraisal. It has indirect positive effects on perceived PTG. Its positive effects on perceived PTG were mediated by the cumulative trauma (effect = .11, se = .03, Z = 4.004, p = .000, Bout LLCI = .07, and Bout ULCI = .17). Adversities and existential anxieties seem to have the potential of promoting PTG. Psychopathology had direct positive effects on perceived PTG. Self-esteem had direct negative effects on suppression. Reappraisal had direct positive effects on perceived PTG and reappraisal. Table 5 includes the direct, indirect, and total effects of each variable and its 95% confidence intervals. Figure 2 illustrates the direct effects of each variable. Psychology Table 5. Path analysis direct, indirect, and total effects of interfaith spirituality, WTELS, cumulative trauma, and EAA on the other variables and their 95% confidence intervals in the first sample (N = 1210).  Notes. *p < .05, **p < .01, ***p < .001.

Structural Invariance of the Path Model in the First Sample
Multigroup structural invariance indicated that the path model of Spirituality dynamics is strictly invariant across genders, religious groups (Muslims and Christians), age groups (adults and adolescents), and between nations (Egypt, Turkey, and Kuwait). Table 6 included the structural fit indexes on the four levels (configural, Metric, Scalar, and strict) for each analysis, which did not significantly differ from each other according to the criteria previously discussed in the analysis section.

Correlation Results in the Second Sample
In this dominantly no-faith sample, as expected, interfaith spirituality did not I. Kira et al. Psychology Table 6. Multi-group structural invariance of the path model between genders, religious affiliations, regions, age groups (adults and adolescents), and countries in the first sample. have the function it has in the faith dominant sample found in the first study.
While interfaith spirituality, in this sample was highly correlated with religiosity, it was not correlated with self-esteem, perceived PTG, emotion regulation, or WTELS and was positively correlated with PTSD. However, similar to the first study, WTELS, showed potentially stronger positive correlations with self-esteem, perceived PTG, and reappraisal and lower psychopathology). Table 7 provides the zero-order correlation between the variables and shows the discussed correlations. Further, IFS sub-scales (direct connection, asceticism, meditation, and divine love), in this sample, showed similar no correlation to those found between these variables and the main scale, except for asceticism, that was correlated positively with perceived PTG (r = .16, p < .05) See Table 8.   Notes: *p < .05, **p < .01, ***p < .001.

Path Analysis in the Second Sample
as predicted, WTELS played a significant positive role in coping with adversities through reducing EAA, increasing self-esteem, reappraisal, and PTGI scores. For details of the path model, see Figure 3.

Discussion
In the current research, we developed and tested two structural models for the relationship between interfaith spirituality, life adversities (CST), WTELS, emotion regulation, self-evaluation (i.e., self-esteem), and different aspects of mental health and perceived posttraumatic growth (PTG) in believers and mostly non-believers. We used a combined three samples of believers (Egypt, Turkey, and Kuwait), and one sample of mostly non-believers from the UK to compare the dynamics of spirituality and WTELS in each. The results identified two circuits or trajectories of mental health and posttraumatic growth production that may function similarly or differently in believers and non-believers: The interfaith Psychology spirituality circuit that is mostly unique to the believers, and the WTELS circuit that is common/shared between believers and non-believers.
The path analysis results provided evidence for the presence of the two different dynamics in faith and non-faith participants. In the first sample of believers, IFS and WTELS both predicted higher self-esteem, reappraisal and posttraumatic growth, and lower EAA and psychopathology. In the second sample of the non-believers, only WTELS was the strong predictor of higher self-esteem, reappraisal and perceived posttraumatic growth, and lower EAA and psychopathology. The results generally confirmed that positive interfaith spirituality dynamics apply only to individuals who believe in a higher power, and generally do not function in the same way in the non-faith group, except for asceticism practices (that implied self-transcendence) that usually do not need a belief in a higher power. The study validated the new model of interfaith spirituality (that included a direct connection with the creator, asceticism, meditation, and divine love) as a critical positive variable in enhancing emotion regulation, self-esteem, and perceived post-traumatic growth and on alleviating the existential anxieties and psychopathology associated with severe identity and cumulative adversities in faith-holding individuals regardless of their faith, gender, or culture. The correlation between IFS and self-esteem was the highest (.31) in faith groups, while it was not significant in the no-faith group (in contrast to the association between WTELS and self-esteem that was .61 in non-believers, and .44 in believers). Diagnostic criteria and empirical research suggest a significant connection between low self-esteem and psychopathology, especially with depression and anxiety e.g., (Sowislo & Orth, 2013). Interfaith spirituality involves self-reappraisal as connected to a higher power and the ability to self-transcend. Reappraisal had a significant correlation with IFS in the believers while this rela-Psychology tionship was not significant in none-believers. Self-reappraisal as related to a higher power may lead to higher positive self-evaluation and higher self-esteem. Self-transcendence facilitates change in perspective and behavior. Reappraisal of the threats to the person and self, using the new spiritual lens, contributes to relieving the intensity of existential concerns. There is empirical evidence that the meaning found through such existential turmoil predicts unique variance in higher self-esteem, and lower depression and anxiety (Wilt et al., 2021). There is evidence that self-esteem is one of the mediators of the positive effects of spirituality on well-being e.g., (Faull & Hills, 2004;Joshanloo & Daemi, 2015).

Interfaith Spirituality Circuit and Its Dynamics
Interfaith spirituality seems to alleviate, in believers, existential anxieties that emerge with adversities and cumulative traumas' existential threats e.g., (Graham et al., 2001). A considerable body of literature provides consistent evidence of the positive correlation between existential interfaith spirituality (IFS) and self-reported, high quality of mental and emotional health e.g., (Exline & Rose, 2013;Faull et al., 2004;Pargament, 2013;Sawatzky et al., 2005). A meta-analysis (Smith-MacDonald et al., 2017) found that spirituality is associated with lower PTSD, in veterans. Further, a review found empirical evidence of an inverse relationship between spirituality and externalizing disorders in adolescents (Holmes & Kim-Spoon, 2016). While there is evidence of the inverse relationship between spirituality and varieties of internalizing and externalizing disorders, the evidence in bipolar disorder and schizophrenia (thought disorders) is insufficient e.g., (Bonelli & Koenig, 2013).
The links between spirituality perceived PTG, and PTSD was intensely researched in the literature. There is replicated evidence of the positive association between spirituality and perceived posttraumatic growth (PTG) e.g., (Pargament et al., 2006). Longitudinal research suggested that perceived and actual growth reflects different dynamics and outcomes. However, the research suggests that the current PTG scale measures perceived (but not actual) growth e.g., (Frazier, et al., 2009). Also, there is evidence of a non-linear quadratic relationship between trauma severity and perceived PTG (Kira, et al., 2013a), and between perceived PTG and PTSD (Kleim & Ehlers, 2009). There is evidence that striving for high standards in perfectionism literature is positively associated with perceived PTG, while self-discrepancy (e.g., spiritual struggle and moral injury) is negatively associated with perceived PTG e.g., . These results suggest a link between interfaith spirituality and personality dynamics of selfdiscrepancy and striving. Future studies may investigate if IFS is associated with the actual or the perceived (potentially illusionary PTG), and probe the potential links between IFS and personality dynamics.

WTELS Circuit and Its Dynamics
WTELS circuitry, while it exists with the same dynamics in the believers, is especially powerful in non-believers and seems to be the strong trajectory that chan-I. Kira et al. Psychology nels WTELS positive effects in lowering psychopathology and raising perceived PTG through setting off the same mechanisms of lifting self-esteem and emotion regulation strategy of reappraisal. Reappraisal is a crucial mechanism in the positive effects of cognitive behavior and mindfulness therapies (Garland et al., 2017) and some other therapeutic interventions. Cognitive reappraisal is a commonly used and widely studied emotion regulation strategy that involves re-interpretation of a situation or event to alter its emotional impact (Gross & John, 2003). Studies support that reappraisal plays an important role in long-term psychological health and the process of meaning-making for a meta-analysis, see (Aldao et al., 2010;Webb et al., 2012). Further, a reappraisal of the event through a new lens helps to recalibrate one's belief and value processing system and life projects accordingly (Aldwin et al., 2014) which contribute to reducing the cognitive dissonance, self-discrepancy, and existential anxiety created by the events. This process positively enhances self-esteem, improves mental health, and facilitates perceived posttraumatic growth, c.f. (Park & Folkman, 1997). This process can be delineated in the following positive trajectory chain: Trauma > (leads to) increased cognitive and self-discrepancy and existential anxiety (existential turmoil) > initial automatic appraisal > conscious deliberate reappraisal > recalibration of the person's belief and value processing system > decreased cognitive and self-discrepancy and existential anxiety > positive self-evaluation and improved mental health> perceived posttraumatic growth (see Figure 1). This process is active in both circuits of IFS and WTELS in believers and non-believers.
We emphasize the significance of the WTELS circuit in contributing to mental health and PTG in both believers and non-believers. It is for the non-faith/atheists the primary and the strong circuit in coping. There is empirical evidence that the "will to survive" predicts the emergence of different positive coping strategies to oppression (i.e., militancy, political ideology, social support, forgiveness) (Kira et al., 2014a). The existential integrative concept of "Will to exist, live, and survive (WTELS)" is the intrinsic innate meta-motivation to exist, live, survive, self-actualize, and succeed/thrive (Kira et al., 2020e). It is a leading existential meta-motivation that steers the person's specific motivations and related general and specific life goals and objectives. It was found to be highly correlated with resilience and negatively with PTSD, internalizing, externalizing, and thought disorders. (Al-Daylami, 2005), (a Sufi thinker) had associated the instinct to live and exist with spirituality and mystical love.
Testing the effects of spirituality on mixed samples of believers and nonbelievers can be misleading. It is important to develop in future studies measures for secular spirituality that can be tested in believers and non-believers, while interfaith spirituality should be reserved for samples that represent believers from different faiths. This study is the first to demonstrate that the positive effects of interfaith spirituality are present only in the believers, which may be common sense, but have never been addressed or tested in any study we are aware of.

Implications for Clinical Practice
For faith-holding individuals, spirituality-based theories and practices inspired various therapeutic interventions in the discipline of psychotherapy e.g., (Park & Slattery, 2013;Post & Wade, 2009). Spirituality inspired different evidence-based interventions in psychotherapy are emerging. Examples are mindfulness, forgiveness, acceptance and commitment therapy (ACT), meditation, and transcendental meditation c.f., e.g., (Park & Slattery, 2013;Pargament, 2011). Further, spirituality inspired transcultural psychotherapy that introduced traditional and non-traditional forms of healing that are still developing and promising fields e.g., (Gone, 2010). Spirituality-inspired psychotherapy interventions may be more secular and help cope with extreme stressors and make sense of life and death for believers and non-believers. However, more research is needed to explore its potential differential effectiveness in believers and non-believers. Further, current results found that some elements of interfaith spirituality, i.e., asceticism practice, are still effective coping strategies even for no-faith individuals and need to be developed and tested as a therapeutic intervention. Practicing asceticism is an ignored intervention strategy that can be effective for believers and non-believers.
The study has several potential applications and implications for believers and non-believers. For believers, the four domains of spirituality provide a map that helps to detail and further develop different inter-faith trans-diagnostic spirituality-based interventions related to each domain. That is, especially important for the domains that have been found most relevant to alleviating existential anxieties and relieving depression and psychopathology, and enhancing PTG and positive self-esteem. All spirituality components are significantly positively associated with self-esteem, reappraisal, and suppression. They were significantly negatively associated with externalizing, thought disorder, and depression.
However, "direct connection with the Creator" seems to have the strongest negative association with existential concerns (EAA), and depression, and the strongest positive association with self-esteem and will to exist, live and survive.
"Asceticism" seems to have the strongest negative association with internalizing, and thought disorder, and the strongest positive association with emotion regulation. Asceticism is operationally defined as: "Controlling extreme passion for material things, not wasting and get satisfied with little things; Modesty and being realistic and knowing the real value and limits of me; The ability to control my wild desires and craves; Being self-satisfied, grateful and virtuous e.g., being kind, fair, open-minded, having integrity, wisdom, and honesty)" is related to different mental health perspectives including the strength model of self-control and ego depletion (Baumeister, 2002;Baumeister et al., 2007). High self-control predicted good adjustment, less pathology, better grades, and interpersonal success (Tangney et al., 2004). Another related perspective is the conservation of resource theory (Hobfoll, 1989) which is based on the supposition that people strive to retain, protect, and build resources and that what is threatening to them Psychology is the potential or actual loss of these valued resources. Conservation behavior is found to be related to satisfaction (De Young & Kaplan, 1985). Another perspective related to asceticism is modesty and other virtues which all are among the signature strengths highlighted in the positive psychology movement and all proved to have positive mental health outcomes (Seligman et al., 2005).
"Meditation" seems to have the strongest association with PTG, as well as a strong association with the emotion regulation strategy of reappraisal. Different meditation approaches were used to increase awareness and provide more veridical perception, reduce negative affect and improve vitality and coping, and improve stress-related outcomes (anxiety, depression, stress/distress, positive mood, mental health-related quality of life, attention, substance use, eating habits, sleep, pain, and weight) in diverse adult clinical populations. Results of meta-analyses provided evidence of a small to moderate effect size of its effectiveness e.g., Goyal et al., 2014;Sedlmeier et al., 2012).
"Divine love" seems to have the strongest negative association with suicidality and externalizing behavior and has a strong negative association with EAA, and positive association with "will to exist live and survive". This differential strength of potential effects of each component of spirituality may help individualize interventions and developing a flexible package for an inter-faith spirituality intervention model that utilizes flexibly its different components according to each client's specific clinical needs. Mindfulness, forgiveness, and acceptance and commitment, and meditation and transcendental meditation may be developed as part of a more comprehensive intervention model that utilizes the components of spirituality for believers and non-believers.
Further, combining spirituality intervention with an intervention that targets "will to exist, live and survive" (WTELS) can increase its total effectiveness, as WTELS has comparable strong positive effects on mental health and perceived PTG. Future research needs to explore more and replicate the potential differential contribution of each component of spirituality and the combination of spirituality and WTELS interventions. The shared WTELS circuit between believers and non-believers found in the results may be translated into WTELS-focused intervention for believers and non-believers. The potential effectiveness of the designed spirituality and will-to-live based intervention and prevention programs can be tested in controlled trials.

Conclusion
To recap, these findings suggest the existence of two strong positive trajectories to mental health and PTG: Interfaith spirituality and WTELS. Both are existent in faith-holding individuals, while the WTELS pathway is the prime pathway for non-faith individuals. Both pathways, in believers, had direct and indirect negative effects on psychopathology, and positive effects on PTG, and their indirect effects on psychopathology and PTG were mediated by self-esteem and reappraisal. These findings suggest that focusing on cultivating spirituality in indi-Psychology viduals who believe in a higher power, in addition to WTELS, has the promise of significant healing and growth. However, more future research is needed to be able to replicate these findings and generalize these conclusions and develop effective prevention and intervention strategies tailored to the person's belief system as well as transdiagnostic interventions to enhance and optimize the person's WTELS.

Limitations of the Study
The current study has several limitations. One of the limitations is that the study was conducted in a convenient non-clinical sample that may have limited and biased representation. We recommend more studies that use more representative clinical and non-clinical samples. Another relatively important issue is related to the composition of the second sample. While the second sample included over 70% of non-believers, it included 24% of Christians which may make the results limited in its scope. Another limitation is that the measures we used are based on participants' self-reports, which could be subject to under-or over-reporting of events due to current symptoms, embarrassment, shame, or social desirability. Another limitation is that the study utilized a cross-sectional design in testing the mediated model. Mediated models contain causal paths that inherently involve the passage of time and testing these paths with cross-sectional data can produce biased estimates (Maxwell & Cole, 2007). Future studies may use longitudinal studies if feasible to retest the proposed model. Additionally, we should caution that the use of terms like direct, indirect, and total effects should be understood as they were meant and intended in their use in path analysis.
Further, we have to exercise caution in interpreting the path model for the UK sample, as the sample size does not provide strong power. Additionally, while the measures we utilized were scientifically translated to the Turkish language, but they have never been validated on Turkish populations except for the cumulative trauma scale (Eltan, 2019).