Tonus -The creation of god(s) was probably a very lengthy, gradual process. Many ideas and explanations would have been offered. The ideas and explanations that could be most easily tested and challenged would have been filtered out over time. The ones that were difficult or impossible to disprove would have held on longer, and eventually been refined.
Suddenly these primitive people, supposedly more evolved til then to primarily just survive, don't sound so primitive after all.
But again, why would they go through all this to begin with? What would have been the advantage obtained that couldn't be obtained thru any other means? If it was simply to satisfy knowing the unknown, why would it matter if you knew it was wrong anyway? And even so, why not just claim to know yourself...why attribute that knowledge to a god? Wouldn't that have been more logical?
The appearance of God and gods in ancient writings everywhere simply affirms how either the concept of God was instinctive in man, or how genius the guy who made it up was.