Apparently as a teacher, you can say creationism is superstitious nonsense, not because it's absolutely true but because teachers have qualified immunity and should get a bit of leeway rather than the hard boot.
Also the court finally reversed their decision on some math teacher who was hanging up religious posters. When the initially decision came down I thought it was amazingly stupid. It's not about the teacher's freedom of speech but rather about the teacher in his role as an agent of the government. He doesn't get first amendment protected because the first amendment is specific to restrict what he can do.