How about teaching both viewpoints? Or teaching evolution and atleast mentioning the ideas of creationism?
An example where it might be good to teach both viewpoints could be the "metabolism first" and "genetics first" viewpoints on how life began. This is because there are many scientists on both sides of the issue, and almost all of them would concede the other viewpoint could yet be proven correct. So they're both credible scientific viewpoints.
Creationism is not a credible scientific viewpoint, because there are not a non-trivial number of scientists arguing for it. And the scientists in the consensus see absolutely no merit to this viewpoint. So it meets the threshold of not being worth the students' time discussing it. And mentioning it in a science class is only going to confuse them.