There's every reason to think that personality traits such as religiosity, and indeed simple desire to have children, are genetically influenced. (Not that it'

There's every reason to think that personality traits such as religiosity, and indeed simple desire to have children, are genetically influenced. (Not that it's been proven, but that's where one should bet.) There's no need to assume there's no gene flow between sub-populations. Indeed, the existence of gene flow would be why some genetic variants favouring desire to have children could become dominant. There's also no need to assume group selection - individual selection is obviously quite sufficient. And there's no call for describing this as "devolution". You're maybe confusing the original poster with one of the replies...