I wonder when did man learn to write? And in the beginning I think they expressed by drawing things.
So I wonder if pre-flood civilization learned to write? or was the book on Enoch written after?
The books of Moses Genesis-Deuteronomy must have been completed after since it even records the death of Moses. And it has names of cities named much later such as I think Bethel.
Also the Revelation 12 I believe is referring to after the birth of Christ Satan's will was to devour the child but when he failed then there was war.