While Carl soaked in Italian rays, he treaded the town in his English footgear (black socks and open-toed sandals, to be exact), pondering the differences Protestants have with the Pope and his posse. Over the years, we've hosted numerous guests from the Roman Catholic persuasion on the show so it's no surprise folks have been wondering: on which doctrines do we agree, and on which must we disagree? You may be surprised!