My personal opinion is that it does a disservice to kids to shelter them from it. If they believe fine and if they don't fine. But at least they know what it is. Quality parenting can guide a kid through so they can make their own decisions. Same with atheism. A kid knowing what it is and isn't I don't believe is a bad thing.
But who is that teacher to give my child something I do not agree with in a public school setting?? ..can I give your children something you don't agree with?? That is all I am saying