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It is natural to believe in God, so more intelligent individuals are more likely to be atheists. Religion is a cultural universal, and its practice is observed in every known human society. However, as I explain in earlier posts (Why do we believe in God? Part I , Part II ), recent evolutionary psychological theories suggest that religiosity may not be an adaptation in itself but may be a byproduct of other evolved psychological mechanisms variously called the “animistic bias” or the “agency-detector mechanisms.” These theories contend that the human brain has been selected to agency – personal, animate, and intentional forces – behind otherwise natural phenomena whose exact causes cannot be known.