First, the only argument that I might have is that I don't have any arguments.
Second, anyone who doesn't accept the reality of the universe and what he does, says, and thinks therein, might have a hard time understanding the proof of the real God. Anybody who accepts the reality of the universe and what he does, says, and thinks therein, knows about the real God in his heart, even though he might not acknowledge Him.
Or basically mumbo jumbo mumbo jumbo mah god iz d rl god
I was just doing a seminar on Sumerian deities, and went across Enki instructing Atrahasis to build an arc to save people from a terrible flood
1000 years before Moses
Moses just didn't have Enlil making the flood because he couldn't bear peoples noise (it prevented him from sleeping)
Rewriting old stories can be found throughout the bible
Sumerian dating is off. The earth is only about 6,000 to 6,200 years old. http://www.albatrus.org/english/theology/creation/biblical_age_earth.htm