No, not the Grand River in Grand Rapids, Michigan, where some of our spiritual relatives gathered after immigrating from the Netherlands in order to establish Reformed churches.1 But the Tiber River in Rome, Italy, where some of our ecclesiastical relatives are gathering today, there to destroy Reformed churches. They are there, ready to forsake Reformed tradition and join the Roman Catholic Church. “Crossing the Tiber” is an old expression describing what a Protestant does when he leaves the Reformation faith for the Roman Catholic fold. The Tiber River ran alongside old Rome; to get to Rome, one crossed it. Thus,...