I know. You’re still trying to get over the shock of learning that little Billy Dembski admits to being a biblical literalist. Brace yourself for this one, then: Glenn Beck is also a creationist, and his reasons are really, really stupid.
You know, if you know so little about evolution that you think the fact that monkeys aren’t turning into humans is a credible argument, maybe you should have “MORON” tattooed across your forehead.
Evolution is an engine of diversity. It produces “endless forms most beautiful”, to quote the guy who thought it up. Asking why different species don’t all evolve into us is about as dumb as asking why every kaleidoscope doesn’t produce the same image every time you turn it.