No one really knows how the bible was written or when, or who for that matter. All we know is it was written by many a very long time ago.<quoted text>
It is a mistake to assume that the pages of the Bible follow their timeline of being written. Many experts think that Job is the oldest book of the Bible. And it is far after the Pentateuch that was supposedly written by Moses in the regular Bible. And you later version of the Genesis story is not a correction, at best it is a simplification. It is still terribly wrong.
As far as the books/chapters/verses, they could be out of order just as easily some of the interpretations of what was written could be wrong.