Nice column of Peter Singer here.
He takes 3 topics where freedom of religion seems to be involved: ritual slaughtering; Catholic Hospitals; contraception and Obamacare; and Torah not going into military service. Interesting read:
But prohibiting the ritual slaughter of animals does not stop Jews or Muslims from practicing their religion. During the debate on the Party for the Animals’ proposal, Rabbi Binyomin Jacobs, Chief Rabbi of the Netherlands, told members of parliament: “If we no longer have people who can do ritual slaughter in the Netherlands, we will stop eating meat.” And that, of course, is what one should do, if one adheres to a religion that requires animals to be slaughtered in a manner less humane than can be achieved by modern techniques.
Neither Islam nor Judaism upholds a requirement to eat meat.