Here is my point: I know that previous Supreme Courts have ruled the Bill of Rights are individual rights, but the fact is that the first amendment does start with what George Will calls "the 5 most beautiful words in the English language":
Congress shall make no law . . .
It is very easy to argue that the First Amendment doesn't apply to state laws, and in fact state laws in the early 19th century bear that out.
AFAIK, there is not a LAW that says that the pledge should be recited; however, this may be a requirement of the individual states. I seem to remember a discussion about that a few weeks ago.
I'm sure someone can remember this one - where the conservative kid, I think he was in Santa Monica, asked one of the administrators about the recitation of the Pledge, and noted that the state required it.
I can't remember the kid's name, nor the details - he appeared on Larry Elder's show and got called on the carpet for it.