Praise be to the Flying Spaghetti Monster!
You're right. It's not required. Although any public school teacher that says "Let's all stand for the Pledge" and leads the class in the recital (espceially to the very young who don't know the difference) constitutes the same problem.
Personally, I don't care what the outcome of all this is. It does not affect me at all. I'm just interested in the game. It's fun to watch.
Why?