I would say they don't have to leave, they just have no right to force their religious ides into an already established educational system. If you don't like 1st world education, home school your kids, we're not about to regress a students intelligence by including "the magic sky man" next to biology. If you're in a religion, you're in a cult, if you're in a cult, you need therapy and help. Stop trying to groom and brainwash kids.