If, in the course of teaching "science" the theory that man evolved from more primitive beings is being taught, and if, in the course of teaching "science" the class discusses possible theories for the creation of the universe, and the earth, then the theory of the earth being created by God, and people coming about in the way which the Bible depicts, must be included. Otherwise, you are denying children the opportunity to hear all the 'theories' and the school is provided them with only a biased view.
If they're not going to discuss the creation of the universe, and the various theories for the existence of man, then of course, Creationism would also have no place.
So it's either both, or none. But to claim that children should only be taught one THEORY is irresponsible, biased, and unacceptable.