Where do you get this notion? It is not in the Bible. Nor did any of the Church Fathers hold it. Apparently, the Apostles forgot to tell them? Did Christ let His Church slip into mass confusion for 1500 years? Even though He promised that the gates of hell would not prevail against it, and that He would send the Spirit to guide it? Really?
Jesus Christ is the head of the Church and Christians are considered members of his body.
Catholics have never denied this.
Jesus Christ is THEE authority of his church and his body.
Apparently, you mean to say that Christ is the only authority of His Church (since Catholics believe that Christ is the highest authority of His Church). Do you think the Apostles had no authority? Do you think the bishops which the Apostles appointed in every city to which they travelled (as the New Testament records) had no authority? How then could there be church discipline, and casting out of heretics and evil-doers, if there was no human authority in the Church while Christ is in heaven?
-A8
"Apparently, you mean to say that Christ is the only authority of His Church"
Jesus Christ gives authority to those he gives authority to in varying times and situations.