Chief,
There was not a world flood all evidence points to a regional flood from the black sea. Can you explain why the Babylonians had an almost identical flood story The epic of Giglamesh. this was probably written before genesis that early christian writers used as a basis for their story. There are several other flood stories written that are almost identical to the one in genesis. This was an old folk tale that was passed down from generation to generation before it was written down in the book of genesis.