firelight

Parents have a right to know what their child trusts them to know.

Lol.

What do you think that reason is?

That is a monstrous claim, as children have a right to their own religion and exercise thereof under the First Amendment, too.

How does blocking a law that forbids schools from telling parents information about their children violate the child's first amendment rights?

What's the problem here?

Schools shouldn't be allowed to keep important information about students from their parents or legal guardians, let alone required by law.