So you believe in the great flood of Noah?
I don't believe in Noah, or a flood commissioned by God to purify the earth - Just pointing out the obvious error in Mercediez post.
I wouldn't however discount the flood itself. I know that in North America during the postglacial period massive ice sheets melted forming immense lakes that dissapeared, geologically speaking, in the twinkle of an eye. This consists with the "earth diver" story of first nations people. Water as far as the eye can see. For this to happen in Europe wouldn't suprise me. People would surely tell "stories" or "myths" to explain this phenomenen.
So a massive flood I can believe in, though it didn't cover all of earth.
Noah making a boat with 2 of each animal, not so much.