there have been many considerable disasters throughout the history of the earth. several of these have been floods. the bible doesn't say there was a considerable flood. the bible says there was a flood that covered the very tops of all the mountains in the world. so either the bible is just a collection of old myths, or a subjective "history" book written by a particularly nasty people, or god lied. it cannot be inspired by the god it claims to be inspired by and be a history and have lies in it. and it's not a half truth; it is a whole lie. whole area surrounding black sea =/= whole earth.
my solution is that it was writen by flawed people who really experienced what they decided was a real god (and may or may not be) and also wrote down all their horrible, ethnocentric garbage.