My reply to the "argument from biblical archeology" has always been, well would you convert to Buddhism or Islam just because their sacred texts refer to actual historical places?
Steve Evil is correct. All pre-scientific cultures have their creation stories. The Genesis version(s) are variants of common semitic stories found all over the middle east. The garden of Eden was called Dilmun in babylonian myths. Noah was named Utnapishtim in Sumeria.
Genesis is not lousy science, it's not science at all. What it is, is beautiful stunning poetry containing some great stories.
If I may let me recommend Robert Alter's modern english translation of Genesis. It's worth it just for the notes on some of the more disputed passages. For instance, Christians assume that the serpent in the garden is Satan come to tempt Adam & Eve into sin. But that's not what it meant to the ancient Hebrews at all.
http://www.amazon.com/Genesis-Translati ... 076&sr=1-1
Imagine starting your college class on Homer by arguing whether the Iliad or the Odyssey actually happened!