Pete,
It would seem that you are less interested in considering Noah then you are refuting him. Does it make a difference what might have been before, or might have been after? Would it mean anything to you? The evidence that you constrain the answer to is unnamed. And if we have a mountain of evidence, do we arrive at the correct answer? As an example, take notice of the Grand Canyon. Was it really the Colorado River slowly carving away over untold millions of years...or was it something else...something more catastrophic? Many arrive at answers to these questions based largely on belief, or lack of the same, and not so much the evidence.
Luke