I checked both "Agnostic" and "Christian", because I'm a fairly agnostic Christian.
I don't believe in Creationism, because I refuse to believe that there were vegetarian velocirapters that dined with Adam and Eve (see here
I just don't like the way conventional Christianity tends to be presented. that's why I'm not at church too often.
And just for kicks, here's
something else at the Creationist Museum that may offend you.
EDIT: I don't believe in Evolution either. Just doesn't fit the text of the bible.