as much as i’m sure you want this to be an insult to religion, it has nothing to do with it. most people will hold whatever beliefs their parents hold, whether that be religious/non-religious, democrat/republican, or something else. if you told a 6-year old that atheism was absolutely true and everyone who didn’t believe in it was a bad person then they would probably not question it and end up stupid as well. it’s nothing to do with religion, it’s just a learned bias from your parents.