There are few issues that raise the ire of the religious as a member changing religions. Apostate is the mildest term used for such a person. Mikhl Yashinsky's "The Gospel According to Chaim" at Theater for the New City tells of such a person, the eponymous Chaim Einspruch, played with beatific authority by the author, himself. This is a true story and a rarity: a contemporary play written in Yiddish. (Supert…