Maybe, one time, millions of years ago, earth was forming etc. etc. kind of possible theory - which I've never really heard of anything besides creationists claiming this and that - is different from absolutely no geographical evidence or blank period in a civilization that would ever back that up, not even in the area he supposedly lived and definitely nothing in the time frame it claims - ever . Water would have to be tens of thousands of feet high to do that, no evidence of that at all, it's physically impossible anyway because there's just not enough water on earth to do this. The Bible has some historical relevance of some things, not aware of any of stories in there like that ever being proven true or close to it. Noah's is a cute story to tell kids, but never ever happened and on no planet is possible.

Just not one of those faith things, it just didn't happen. No evidence of the land having suffered from it, none from the animal/plant species and none from civilization records. That flood story had been passed around long before the Bible of Christianity, like a lot of the stories, it was just passed on with it.