Can we make the starting point to be that the bible is all rhetoric and nothing in it is to be believed as the literal word of your god? I can accept that as the starting point if you proclaim it so. What do you expect me to believe?You must determine the literary style for not only each book but each chapter. That is literally the first thing you must do. That this is a foreign concept to you tells me you have never made a serious investigation of any account in the Bible.
Without that it's not fair to expect an atheist to start in reading the bible with an open mind.
It's much more involved and complicated than just the story of the Ark or the whale.