I don't think Creationism has to be taught in school. On the other hand...
I don't think it would hurt anything to express in some class along the line, that some feel that with the complexities of the material universe and the fact that we have life that is self aware, that there could be some deliberate, intelligent design behind our world. They use this _____ type of examples to illustrate the possibility of a designer. Some feel there is another life form they call spirit, which is self aware, intelligent and capable of thinking, creating, similarly to human beings. Some of the people who support this believe the material world had it's beginning with a designer. They feel their point of view is as legitimate as the theories of the Big Bang and Evolution. Some believe Evolution to be taking place as well. We will not discuss the possible religious aspects of this alternate point of view. (Although, I guess private schools might.) This is something you can find out about in World Religion classes and can investigate outside your school. It is noteworthy to add that a significant percentage of scientists do hold a belief in other self aware, intelligent beings of this spirit type.
That's all that need be said. There doesn't have to be a drawn out course on it.