Why not? Has religion not played a very large role throughout the course of history? Is it not still very relevant today?
There is more than one way that religious based theories of creationism could be presented in a public school. Being taught the potential viewpoints of others is not a bad thing. Prompting one to actually think and possibly look at things from a different perspectvie is not a bad thing. Doing something that may result in one learning ethics in a public school is not a bad thing.