I'll put Jonah up their with Hercules and Samson under the category of legend.
DNA is revolutionizing the field of man's origin. We can know how societies are related. They are less diverse than natural selection would suggest which implies mass extinctions or the so called "bottle necks" where only a small sampling made the trip.
Many societies without Christianity also have the story of the flood. Sumerian tablets interpreted in the seventeenth (or eighteenth?) century speak of such things and they predate biblical scrolls. The three rivers likely converged somewhere under the surface of the Persian gulf - a region that was flooded by some world catastrophe or warming period.
Yet, the bible cannot account for the fossils and evidence we continue to find except perhaps with LAN's assertion that God created a mature world.
This should be in a different thread. I say we get back to bashing nation states.