Since evolution is only a theory and some would say creationism is only a theory, then why would that be "stepping on toes"? If only evolution is taught is that not stepping on the toes of those who believe in creationism?
Okay, sorry, but I couldn't let this one slip past. Evolution is "only" a theory in the scientific sense, which means it has passed a rigorous standard of evidence supporting it. Creationism is more of a hypothesis, which is just "I think this might be the way of it, so now, how can I test it" stage. Scientific theory is not what most people mean, when they refer to something as being a theory.
If Creationism was taught in schools, I would feel it would ONLY fit in a religious category, not a scientific one. But Creationists tend to want it taught as a science, which doesn't fit the bill.
Then again, we would need to teach a multitude of creation beliefs, to be fair. Yes, Creationist Christians belief that theirs is the one true way life began on the planet, but others believe that their religious teachings are the way it is.