Let me just ask: If you were as absolutely convinced of the truth of the Bible account of the flood as a fundamentalist is, absolutely without a doubt knowing that it happened as described, knowing that God is the inspirer of the whole thing, how would you go about answering science's contention that it didn't happen?
Great question Faith. You've restored my, err, faith in you
Simple, it was a miraculous event. The world was changed beyond recognition. Admittedly, you still run up against the old "surely it's deception for the earth to look old..." but that's run-of-the-mill. Perhaps included in God's promise to Noah was a physical wiping out of the memory of the event from the universe? With a Goddidit-with-a-miracle answer, you can't go wrong
And it prevents the "become a Christian because just look at the physical evidence" bullshit I so detest...