It is not evidence of god.
It is evidence that humans wrote it based on the knowledge of the region at that time.
Genesis is not an “eye witness account”.
Eye witness accounts are in any case, the worst form of evidence.
-(Loftus et al 1974)
It is erroneous to the point of hilarity.
The oldest copies have more differences between each other than there are words in any amalgamation of them. This means that it is irreconcilably inaccurate. This means you cannot quote it in debate and expect it to carry any weight.
-(Bart Ehrman et al)