Sir, - So the "comedian" Tommy Tiernan can't understand the hurt he caused to thousands of people by what he called crudely "that piece of material about Christ on the Cross" (The Irish Times, December 4th).Perhaps he, and indeed all of us, might be enlightened by what St Augustine said long ago: "Faith opens the door to understanding; unbelief closes it." - Yours, etc.,Seamus Humphreys,Shop Street,Drogheda.