Creation and the flood of the bible are proved false by evidence that verifies explanation otherwise. If you choose to not accept these parts of the bible then that's a good sign of start of rational thought. Fact remains that you still can't prove existance of a god.
Your info about proving the flood is dated. The more currant info seems to indicate the layers were laid down in quick succession. Consider the evidence provided by Mt. St. Hellens. The folded rock formations around the world. The volcanic action studied in the Grand Canyon.
"Only Christ is the fullness of God's revelation." Everyday Hunter
