so there was no reasoning at all in the start of religions? My (admittedly limited) knowledge of religion shows significant levels of understanding of the world around them. Christians understood the need for distance in familial relationships way before genetics and inbreeding was understood. Equally some of the Eastern religions show amazing reasoning in the extrapolation of natural events into ideas that were incorporated into their religion.On your first point about the Bible being written in a time when we didn't understand stuff etc. are you saying that because we know more about how the earth works and how we as humans work and how Eco systems fit together, and about the solar system and Galaxy etc that that means there is no God?
No, not at all. It means there never was a God but primitive man invented one to describe and explain the universe because our brain evolved the need to problem solve before it developed the ability to reason. Your argument here still relies on there being a God, this is the same as trying to debate with a conspiracy theorist who keeps saying your point of view is absurd because it doesn't rely on a critical point of their own argument.
That's way later than the start of religion. The start of religion is pretty much paganism, and is about observation not reason,