In schools, the issue of December holidays gets about as sticky as a half-eaten candy cane. Schools should rightly not assume every child’s family celebrates the same holidays and in the same way.
But there should be room for traditions. Go ahead and have a “holiday” party, but educate children about all holidays — religious, ethnic, even political. There are certainly enough divisions between religions in this world. It would be nice to focus attention on understanding, and that comes through exposure and education.