I JUST FINISHED writing a letter to the co-author of a great play that I saw last evening. The co-author is Max McLean and the play is “Martin Luther on Trial.” The other author is Chris Cragin-Day. I am encouraging anyone who loves theatre or is interested in religion, to get to the Pearl Theatre, which is in Manhattan on 42nd Street between 10th and 11th avenues. The play’s run will end on Jan. 29.