I think the lack of ornamentation in the Noah account is its greatest strength....I think it was the original straight account....the other flood accounts such as the highly ornamented epic of Gilgamesh were drawn from it, not the other way around!
Now if you want to argue it a myth...well that's a whole other thread!
Gilgamesh is dated before the Bible.
Your thesis is unsound. The whole Noah sequence is severely flawed. It had been debunked thoroughly. Go to talkorigins and look it up.
he hasn't got a clue, but he's a christian, or as Nancy grace would say, "uh-huh, uh-huh"