Random weird thoughts! Be prepared.
So, let's assume that there is no god. Or at least not one that is actively involved in humanity/the universe. Meaning that if there is an intelligent, creative force behind the universe, it kicked everything into motion and then tottered off to do something else. Therefore, all 'revelation' is man made. Got it?
Okay. So we're the ones writing every religious text ever. There's no divine mandate, nothing. It's just people. Why do we write religious texts? Hell, why did we invent a personal god to begin with?
Because humans are imaginative. We look around us and don't just focus on survival, food, shelter, etc. We wonder 'why' and 'how'.
We see the world around us and the plants and the animals and we feel that we are vastly superior to all of them. The animals, after all, while adapted to their lifestyle and their environment, have never learned to speak. To have societies, build tools (ignoring the animals that do, in fact, use primitive tools), have written language. They do not express themselves as we do, they do not seem to feel as we do. I don't speak of nerves and pleasure/pain responses, but emotions. We anthropomorphise many animals, saying that they mourn, etc. etc. and some do, in their own fashion. But it's not like *us*. We're superior.
So we've been looking around since we figured out how to and wondering how did this all get here. Why is it that we're so vastly superior to everything else, but we can't control the weather, or the ocean. Why do we get sick and die? Why are we superior to all the other creatures? Why can't they do what we did and evolve into better species? Why why why...
And we invent a being that is like us, but superior to us. And of course, because we're the highest form of life, it must be personally invested in us. So why wouldn't it want to talk to us? To tell us about itself and our origins and what we need to do to become ever more superior? And people start having visions and revelations from the creating being, and eventually it all gets written down, etc. and we wind up with religious texts and rules ad nauseum. Also, someone along the lines figures out that people are herd animals and we all want to belong. Religion is a great way of controlling people, so they roll with it.
But then, if we're inventing the divine because we're convinced of our own greatness, why are we constantly being chastised in the religious texts? The fall of the world being blamed on humanity, sinful, etc.
Well, because we're the center of the freaking universe, of course!
It is, literally, all about *us*. The divine made this perfect world, made us perfect, but because of our amazing powers of us-ness, we screwed it all up. How could we screw up the perfection? See above, about us being the center of the universe.