Christianity would be a better religion with a bit less legislative power, tbh.
I have mixed feelings on the ruling. It causes some significant legalistic problems. On the other hand, if somebody wants to hire me as a writer to write about how trans women are all biological males pretending to be women solely for the purposes of sexual assault and then screams "Religious discrimination" when I turn them down...this ruling gives me some ammunition.
Which isn't to say it's going to bite them back. I have no intention of turning somebody down just because they're a Christian, which would be actual discrimination...