There are two reasons that I'm opposed to teaching creationism in public schools. One is that it's not science. The second is that it is not constitutional. IF you teach it, teach ALL creation mythologies, not just the Christian version.
And this brings me to another point: most people don't understand what they are discussing. Evolution is a fact, much like gravity. Darwin's theory of Natural Selection is one of MANY theories of evolution. I tend to prefer Gould's theories myself, but that's another issue. Back to the gravity analogy, there's the Newtonian theory about gravity and the quantum theory about gravity. We know that it works, and we theorize about HOW it works. Teaching kids about evolutionary theories does not replace religion--evolution exists outside of the realm of religion, since it is a natural force.
Which brings me to another point. Why are the creationists all a twitter about this? My theory is that their entire belief system is based on man's status as being "fallen", which comes from the story of Eden. The creationists erroneously assume that if there is evolution, then Eden could not have existed in a real sense (they can't comprehend the concept metaphor, mythology, or anything like that. Kids don't have a grasp of psychology or literature, I guess. Not that their greatest Teacher taught with parables or anything...), and thus man could not have "fallen". No "fall" means no need for salvation, which means not saviour, and thus no need for Christianity. This scares them. They don't want to consider that they might not be right. I guess that they don't realize that minds are like parachutes, and only work when they are open.
Anyway, enough of my meager opinion on this issue.