....You're disputing Mosaic authorship
No I'm affirming Mosaic authorship. Moses didn't directly experience any of the events he wrote about. He needed revelation from some source, just as Luke or any other writer. Genesis is the product of Moses.
If anything of it existed, it had to have been taken aboard the Ark, and then preserved throughout the generations that descended from the eight souls that survived the flood, specifically to Ur of the Chaldees, where Abraham was educated, and called out, and Egypt, where Moses was educated and called out.
I agree. That's exactly what happened.
And there is not one shred of evidence....
There is. There is textual evidence that writings from Adam, Noah, Noah's sons, and Shem all wrote and passed down documents that were used by Moses.
But to supposed antediluvian cultural influence in the books of Moses is presumption of a diabolical nature
LOL! You think it's diabolical that Adam, Noah and Shem were influenced by antediluvian culture?