I think religion is related to traits humans evolved while surviving. It can be great for social cohesiveness, and prior to our more modern discoveries (Of evolution and a bunch of other stuff) it helped many people with the irritation of not knowing what was really happening.
I also think that religion can't be destroyed because the impulse is too strong for too many people. I think it's better to concentrate on critical thinking, because when people can reason they are less likely to ignore important scientific evidence. Or burn people to death as witches.
I'm most familiar with the Greeks/Romans, so yeah there's a gap. I don't doubt it's not a hard and fast rule but I think there's significant influence.