The problem is that evolution is in reality, a false religion masquerading as science. What we need to be clear about is the myriad of scientific problems with evolution. If students were allowed to see all the problems with it, it would be clear that evolution is one of the greatest hoaxes ever pulled on mankind. Evolution is central to understanding all aspects of biology. One can study biology without studying evolution, but it is like learning chemistry without learning about atoms and molecules or studying English without the vowels.
Science fiction has no business being mixed in with real science in our public school classrooms.
Students can study cells and learn how the various parts interact with one another. They can see that mutations are almost always harmful. And those that aren't harmful result in the loss of information from the DNA, not an increase. Evolution is a belief with no solid scientific evidence to support it. Not only is it unnecessary to the study of biology, it has no business being included in the curriculum to begin with.