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God has been many things on stage, but not, to my knowledge, a chain smoker. And though I can recall a long-ago student production of an English mystery play at the Loeb Experimental Theatre in which God forgot his lines and the Archangel Gabriel had to cue him, I don’t ever remember Gabriel demanding that Heaven-bound souls leave their coins and watches with him as they pass through the pearly gates. God and Gabriel are just two of some 20 delightfully outrageous characters — all portrayed by Colin Hamell — in Bernard McMullan’s darkly funny “Jimmy Titanic,” which has come to the Arsenal Center for the Arts, in a Tír Na Theatre production helmed by former Súgán Theatre artistic director Carmel O’Reilly.