This study examines the effect of religious heterogamy on the transmission of religion from one generation to the next. Using data from 37 countries in the 2008 Religion III Module of the International Social Survey Programme (ISSP), I conduct a cross-national analysis of the relationship between parents’ religious heterogamy and their adult childrens’ religious lives. By estimating fixed effects regression models, I adjust for national-level confounders to examine patterns of association between having interreligious parents during childhood and level of adult religiosity as measured by self-rated religiousness, belief in God, and frequencies of religious attendance and prayer. The results indicate that having religiously heterogamous parents or parents with dissimilar religious attendance patterns are both associated with lower overall religiosity in respondents. Parents’ religious attendance, however, mediates the relationship when each parent has a different religion. Having one unaffiliated parent is associated with lower religiosity regardless of parents’ levels of religious attendance. The negative impact of parents’ religious heterogamy on religious inheritance is independent of national-level factors and has implications for anticipating changes in the religious landscapes of societies characterized by religious diversity and growing numbers of interreligious marriages.

Social surveys normally assume that respondents adhere to a single religious faith in belonging, believing, and practicing congruently. Some surveys even take religious identity as the singular measure of religiosity and examine its relationship with other variables. This practice, however, fails to capture nonexclusive and hybrid religiosity, which is arguably the traditional and normal pattern in East Asia while becoming increasingly common in the West. We have developed a new set of survey questions and conducted a survey among East Asian international students at an American university. The findings show that multiple religious belonging, believing, and practicing are quite common, the level of believing and participating in religions varies substantially, and no confessionbased single measure of religious identity or practice is sufficient for measuring religiosity. We recommend this set of improved measures of religiosity be adopted in future surveys in East Asia and probably in the West as well.

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In Western societies, religious heterogamy and its effects on religious socialization outcomes have been interpreted through the lens of secularization. How about China, where religion has been resurging in recent decades? Using data from the 2007 Spiritual Life Survey of Chinese Residents, this study shows that despite China's atheist education system and strict religion policies, having at least one religiously affiliated parent is associated with increased religiosity compared to having two nonreligious parents. Whereas religious heterogamy in the West has a secularizing effect on the next generation, religious heterogamy in secular nations, such as China, has a religionizing effect and contributes to religion's rise.

Research has long established that parents who do not share the same religious tradition produce less religious children than parents who do. Therefore, religious heterogamy and its negative effects on religious socialization have been associated with the generational decline of religion in Western societies. How about China, where religion has been resurging in the last few decades? Existing studies suggest two opposing possibilities: the restrictive national context may diminish parental impact on religious socialization, or the family influence withstands contextual pressures. Using the 2007 Spiritual Life Survey of Chinese Residents and logistic regression models, we examine patterns of association between having one or two religious parents during childhood and current religious affiliation, beliefs, behavior, and salience of respondents in China. Analyses reveal that despite China’s atheist education system and strict religion policies, having at least one religiously affiliated parent is associated with increased religiosity compared to having two nonreligious parents. As the number of interreligious marriages rises in Chinese society, religious heterogamy contributes to the growth of religion among younger generations. Whereas religious heterogamy in the West has a secularizing effect on the next generation and contributes to religion’s decline, religious heterogamy in secular nations such as China has a religionizing effect and contributes to religion’s rise.