Not biblical at all The only part of the bible this movie follows is that there's a man called Noah, there's an ark and a flood.
First off I don't remember reading about Korg being in Genesis.
Second, Noah didn't try to kill a baby.
Third, some evil man didn't sneak on board.
Fourth, Korg and his friends didn't build the ark.
Fifth, there's no mention of the tablet with the instructions to build the ark.
Sixth, there's no mention of evolution in the bible.
.. Noah waited 100 years for the flood
... Noah was an old man at the time of the flood
... What's with the magic tape?
TL;DR:
This movie is not biblical at all