It's not just a story, but it is a true story, apart from the artistic freedom

When a movie is so controversial, it is always worthwhile itself investigate. In Genesis 1. 6-9 in the Bible you can read how it was and how not. And yet it is the filmmakers succeeded the true nature of man herauszustreichen. I highly recommend the film and at the same time read themselves.
The Regiseur has for example with The Guardians been thinking if it is not to the sons of God from Genesis 1 from 6.1 to 4, or as it was to accomplish that as much animals were almost a year quietly in the ark.
From me he gets 5 stars for a well-made epic, on a true story.