LOS ANGELES — Sinai Temple is a Conservative Jewish congregation perched on a hill in Westwood, famous for its wealth, its sizable population of Persians, many of whom fled Iran after the fall of the shah, and a well-known and outspoken rabbi who has at times pushed his congregation on ideologically adventurous paths. So it was that three weeks before the Supreme Court cleared the way for same-sex marriage in California, the rabbi, David Wolpe, announced in a letter to the synagogue that gay marriages would be performed in this 107-year-old congregation, as soon as the court ruling he anticipated...