Your logical neocortex is telling you this doesn't add up, which is correct. Why is it so important? really? Just like say billions and billions of people need to suffer and die over a point made when eve bit the apple? Its what I like to call the witness 2+2=5 mentally. Everything your brain wants to reject they need to come up with some explanation that gets you to the desired end result. That the bible is right.
Its analog thinking and its stupid. How much more reliable would a source be that was with god??? If and angel wrote to us "you must not murder" are you going to say wtf does he know, he's not a human like me!! no! What's right is right (biblically speaking) and whats wrong is wrong. Who cares who wrote it. Its just something that helps dubs sleep at night so they can tell themselves the bible is not a book of fairytales.