Unless Engel vs Vitale is overturned, there will be a very sharp limit to what they're able to do. The only references that would be permitted in a science class are the actual scientific evidence. As soon as someone opens a Bible as a way of backing up ID, no court in the country would allow it. Certainly one of the least threatening bogeymen we're facing in modern times is the presence of too much religion in public schools. Not at a time when many schools are cracking down on Christmas caroling during that season, among other crazy things.
We would probably still have Christmas carols in schools if the creationists had not tried to promote flat earth science. This is what turns educated people against religion.