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Mounting evidence supports longstanding claims that religions can extend cooperative networks. However, religious prosociality may have a strongly parochial component. Moreover, aspects of religion may promote or exacerbate conflict with those outside a given religious group, promoting regional violence, intergroup conflict, as well as tacit prejudice against nonbelievers. Anti-atheist prejudice—a growing concern in increasingly secular societies—affects employment, elections, family life, and broader social inclusion. Preliminary work in the USA suggests that anti-atheist prejudice stems, in part, from deeply rooted intuitions about religion’s putatively necessary role in morality. However, the cross-cultural prevalence and magnitude—as well as intracultural demographic stability—of such intuitions, as manifested in intuitive associations of immorality with atheists, remain unclear. Here, we quantify moral distrust of atheists by applying well-tested measures in a large global sample (N=3256, 13 diverse countries). Consistent with cultural evolutionary theories of religion and morality, people in most—but not all—countries viewed extreme moral violations as representative of atheists. Notably, anti-atheist prejudice was even evident among atheist participants around the world. Results contrast with recent polls that do not find self-reported moral prejudice against atheists in highly secular countries15, and imply that the recent rise in secularism in Western countries has not overwritten intuitive anti-atheist prejudice. Entrenched moral suspicion of atheists suggests that religion’s powerful influence on moral judgements persists, even among nonbelievers in secular societies.
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