:On titles, this article on the swastika talks about  Bishop  Sheen, this one refers to Mother Teresa, and  this one refers to   Sister Ruth: "Before entering the religious life as a Dominican nun, Sister Ruth was a litigator with Manhattan law firm..."  This one makes a number of references to Rabbi Kushner.  So apparently it is quite common to use the religious respectful title for (at least) Christian and Jewish leaders.  I don't know the first thing about Sheiks and Imams  and such though.  Also if you are just calling someone "a rabbi" or "a Catholic priest," for example, you do not capitalize it.