I have no indepth knowledge of fossils or the Bible. Without considering any evidence whatsoever, I tend to believe Science because of one simple reason: out of the two systems of beliefs, Science is the more flexible one. If Creationism is the "truth," then I think Science will arrive at Creationism someday. Whereas I don't think one could say the same about Creationism to Science, if that makes any sense.
A overwhelming simplification of the great debate I know. No disrespect intended toward Creationists, just my two cents. Any thoughts at this generalized level?