Firstly, a good scientist should try to fit theories to science, not the other way round. Evolution theory is a THEORY and nothing more. People are always offering up slightly different versions, tweaking here and there (most recent famous example is Richard Dawkin's "Selfish Gene"). Creationism starts with a theory and attempts to fit every piece of scientific evidence to it. In my opinion this is bad science.
Secondly, in my experience creationists ask questions of belief that don't apply to science. I'm always hearing thinks like "Do you really want to believe that you were descended from apes?". I don't want to believe that some people could go into a school and kill children. I don't want to believe that people get bombed to pieces in the name of freedom. I don't want to believe that millions of people have been killed because of their religion. But it all happens.
Finally, I find that creationists go out of their way to find an element of evolutionary theory that doesn't quite make sense, and use this to renounce the whole process. The rules of chemistry say that substances should get denser as they get colder. However, water is most dense at 4 degrees C, and exands below that. This doesn't mean that all chemistry is wrong!
Whirlwind
PS I do know why water expands below 4 degrees!