You're confusing the US's requirement for religious freedom with the education model. It's not like you're forced to pick a school that teaches things you don't

You're confusing the US's requirement for religious freedom with the education model. It's not like you're forced to pick a school that teaches things you don't agree with. For every one of these schools teaching kids religious nonsense that is clearly wrong, there is some other school using that freedom to try alternative ways of running classroom. If you don't allow this you end up with a pretty rigid system that basically everyone but educational board members hates, like the Common Core requirements that are so tight that teachers basically have to design their entire quarter around them.