Religion itself could only flourish within a world view that permits it, don't you think? And it is this world view, an almost intuitive understanding of some fundamental metaphysical truth, that I am suggesting developed independently throughout the world.
Yes, I am anyway.
Humans crave the knowledge of what happens to them after they die. So they create it after a while, and start believing their own crap, and pass it down.
What the founder of this belief chooses to base it on is probably going to revolve around the following themes:
After death, something good will happen to you if you are good in life.
There is a creator.