I think it depends. In Brazil it's common (and lawful) to consume Ayahuasca in certain religious contexts. The biggest religions are Santo Daime and União do Ve

I think it depends. In Brazil it's common (and lawful) to consume Ayahuasca in certain religious contexts. The biggest religions are Santo Daime and União do Vegetal - both are heavily Christian. I know personally several people, many of whom hardcore atheists, who have had life-changing experiences taking part of those rituals and many have gone back or made it a regular occurrence. None of them ceased to be hardcore atheists.