Do you know anything about teaching? For example, what science is taught? Could it be physical science, biology, chemistry--i.e., all science? What is taught in Language Arts: Grammar, spelling, literature, writing, speech....or, could it be all? Let's go on to history. Is only local history taught, or do we teach state history, national history, international history? I'll bet you will concede we teach all of it. Same with PE. Do we teach only basketball and call it good?
Finally, the government doesn't teach. Government's purpose is to provide a place for learning. The government insisting that religion be banned from the learning curriculum can give some of us a shivery feeling about the way power is wielded by government.