To be Jewish according to Judaism on has to be born of a Jewish mother, today the new Supreme Court decided that was racist, that the school had to accept "practice". That has never been Jewish custom, thus 3,500 years of rabbinic tradition was overthrown.
This interference in faith, strikes me as being the thin end of a very dangerous wedge. What is next? Telling a Catholic priest who he may marry, forbidding him to discriminate on grounds of gender? Maybe that is someway off ...but just wait, after all service providers can't descriminate.