For another perspective on this debate, read Rabbi Rebecca Sirbu’s post here.
Aside from the bigamy laws, I mean. (JK)
Recently, a rabbi was appointed to lead a Unitarian congregation. In a discussion about this appointment, I had mentioned that I could not lead a Unitarian congregation, or any other non-Jewish group, any more than I could officiate at the marriage of two non-Jews. I was surprised by the (small) flurry of questions about why, if there was no intermarriage, I would refrain from officiating at such a wedding.
I have many friends who are not Jews. I have attended – and even participated- and rejoiced at their weddings, as well as occasionally been asked for (and given) counsel, or attended other life events, as a friend. When I celebrate at a non-Jewish friend’s wedding, I am a guest experiencing their tradition (or lack thereof). Even if I offer a private blessing, it is the blessing of a friend, but from outside.
A rabbi, even by the broadest definition, is one who is a rav, a master, of Jewish tradition, whose role is to teach Jewish tradition, and model a Jewish life. I am expected to be a kli kodesh – a holy vessel, at least to the best of my ability, and to do so means to have a particular way of being in the world. My permission to teach and to lead comes from being invested in that tradition, it comes from the people of Israel, and from the Torah of Israel. Even though I share some, and often many, values with people in other traditions, we each have different ways of expressing those values, and of understanding them – and they are not interchangeable.
When I officiate at a wedding, I do so as one who has a particular view of what it means to get married, what the marriage means in terms of future Jewish life and aspirations, of particular spiritual valences as part of a whole Jewish life, joined to a Jewish community that is both horizontal – with other currently living Jews, vertical – with Jews who have passed on and have yet to be born, and of course, in a particular relationship with God.