Evolution is a quite dodgy scientific theory in my uninformed opinion, but Creationism is belief in the Jewish creation myth, which is based on God.
unfortunately, God can never be at the basis of a scientific theory - for to be a scientific theory you have to frame it so that it is provable or disprovable.
Please Note: It does not have to be correct to be a scientific theory - it just has to be framed in such a way that one is able to prove or disprove the theory through experimentation.
According to the Xians (and those guys really know the big G), God cannot be proved or disproved to exist (and I believe it's also a sin to attempt to do so) - apparently one has to make do with having faith in the Lord rather than proof. So any theory that ultimate relies on the Big G doing his thang is ipso facto unscientific, even by the Xian definition.
Thus God, as far science is concerned, is meaningless (in the logical sense) - in that one cannot prove or disprove the existence of the big G, you have to have faith.
There is a place for the Jewish creation myth in schools - but in comparative religion classes, with all the other weird and wonderful creation myths from around the world, not biology lessons.
Because while God may have something to do with science, science, properly done, has nothing to do with him.