Actually, Bill, our comments should address the fact that you write from the standpoint of a Presbyterian.  Because the origins of Presbyterianism draw heavily from Calvin, who taught absolute loathing for Transubstantiation, it seems we have an irresistible force meeting an immovable object.  The Catholic Church cannot change regarding the Eucharist without ceasing to be the Catholic Church.  Likewise, Presbyterians/Calvinists cannot change on that point without ceasing to be Calvinists.  Thanks for a thoughtful column.