[Boudica]

This thread was a little rambly, but it sounds like you're asking why each of us believes what we do about the universe's creation?

I suspect big bang is the closest thing to the truth, but I have no resolved idea of what I think spawned the universe, or how it works. I suspect Dark Matter will eventually give us the clues we're after, but I can neither confirm nor deny some of entity exists which caused our creation. I wouldn't really call myself religious, or atheist (although I have been an atheist for most of my life to date). My opinion is that none of us has enough information/evidence or knowledge to know the absolute truth. Religion is faith - a belief with no proof. There is no shame or issue with this. It's a means of understanding our existence, and I have no means to say to someone they're correct or incorrect.

I don't mind whatever people believe, as long as it causes no harm to someone else. However, as the OP says, humans aren't the most pure creatures, and we make decisions that hurt people. Wars around religion rarely have anything to do with religion in and of itself. It's normally a claim to land/power/control, under the sub context of religion. If no religion existed, we wouldn't have any fewer wars or fights.