Do you think it is possible to pass down oral accounts for thousands of years with any degree of accuracy?Again... so what. It's not about when Genesis was written, dummy. The first eleven chapters were oral accounts that were passed down from generation to generation for thousands of years before it was recorded in writing.
The thing that strikes me Ding is that in order to get to the existence of a god you are presupposing the existence of the supernational ( incorporial world). Without ever actually having any proof of it.
Science is a method to try to establish the truth. Not a belief system. It by definition doesn't pretend certainty just probability.
It has over the years proven to be a much more accurate way in understanding the universe than any faith. Of which there have been and are thousands. Each of which professes absolute certainty and very little in the way of actual proof.