How about teaching both viewpoints? Or teaching evolution and atleast mentioning the ideas of creationism?
Because it's a dumb idea to teach creationism/intelligent design in a scientific curriculum in which there is no scientific basis or proof God exists? Because the very concept of faith is that you believe in something in which there is no objective conclusive proof? Because it leads to uneducated children who then stumble around their lives in an evangelicalized torpor bleating #alternative facts, with no real understanding of logic?
All of the above, really!