I remember watching an interview with a mushroom man, he posited that humans have receptors built in for magic mushrooms because humans used to have an organ that provided hallucinogenic euphoria. This allowed humans to survive in groups without killing eachother, then religion eventually evolved socially and replaced it. Now that we have technology and modern governments thats slowly replacing religion.

It was a neat idea anyways. Its also neat to think about how religions could be a form of evolution, even though they arent technically biological changes.