Evolution and creation are both theories....nither can be proven or disproven without a shadow of a doubt, and both should be given equal footing. I am saying this as someone who does not concider himself religious.
Evolution is a theory (in the scientific sense, not in the common usage of the word). Creationism doesn't even rise to the level of a testable hypothesis.
That Scott Peterson killed his wife and unborn child and that they died as a result of a divine bolt of lightning are both theories. Neither can be proven beyond a shadow of a doubt. Therefore, we should just let Scott go free, right?
Note that "creation" is not a theory. It makes no predictions and is not falsifiable. No amount of evidence can contradict that Zeus created the World this morning at 0900 Zulu. For this reason, Creationism is not science and should not be taught as if it were. (Other than to point out that Creationism doesn't rise to the level of an hypothesis, much less a theory.)