pjones: The belief that God (for some value thereof) originally created the universe a long time ago is not incompatible with science (knowledge of what happened before the big bang is impossible). Similarly, the belief that the process of evolution was either begun or helped by God is non in conflict with science, although it is non-falsifiable.
However, the belief that the Earth is only 6000 years old is incompatible with science, since there is huge quanties of evidence suggesting that the Earth is much older. Similarly, the belief that speciation is impossible (widespread among creationist I have known) is also incompatible with science.
Finally, which is a better candidate for belief, a theory which has 150+ years of accumulated evidence, or a theory that was proved incorrect almost 100 years ago? Despite this, however, many people continue to drone on about the so-called "theory" of evolution, all the while taking Newtonian mechanics as truth.