The always outspoken and controversial ethicist, Peter Singer, calls on religions that require ritual slaughter of animals to become vegetarians:
When people are prohibited from practicing their religion – for example, by laws that bar worshiping in certain ways – there can be no doubt that their freedom of religion has been violated. Religious persecution was common in previous centuries, and still occurs in some countries today.
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. And I am not calling upon Jews and Muslims to do any more than I have chosen to do myself, for ethical reasons, for more than 40 years.
Restricting the legitimate defense of religious freedom to rejecting proposals that stop people from practicing their religion makes it possible to resolve many other disputes in which it is claimed that freedom of religion is at stake. For example, allowing men and women to sit in any part of a bus does not violate orthodox Jews’ religious freedom, because Jewish law does not command that one use public transport. It’s just a convenience that one can do without – and orthodox Jews can hardly believe that the laws to which they adhere were intended to make life maximally convenient.