I teach, and as kids were leaving for Christmas break one year I was wishing them a Merry Christmas as they walked out of the door. On girl says, “But I’m Jewish.” I said, “So was Jesus. Have a Happy Hanukkah and a Merry Christmas.”
Every school should have at least one atheist teacher on hand, right?
So, come Christmas vacation, assign that teacher to oversee detention, and all the kids that want to be offended by Christianity or aren’t Christians can show up, every day, all day, and sit quietly and study.