By Jesse Romero and Paul Zucarelli, Catholic Exchange - Our Lord prayed “that they may all be one; even as thou, Father, art in me, and I in thee, that they also may be in us, so that the world may believe that thou hast sent me” (John 17:21 [emphasis added]). True unity is visible, doctrinal, and spiritual... When will Muslims, pagans, Jews, and atheists believe in the Lord Jesus Christ? It seems unlikely to occur until at least all Christians are united under His universal pastor, the pope, and His bishops.