He did appoint St. Peter and his legitimate successors to be the rock upon which He built his Church.
This current occupant of Peter's throne is not Catholic, nor is he Christian and is the final insult hurled at the few true faithful as a result of Vatican II. All that has happened since II is a refutation of Christ.
Wrong. Jesus Christ is THE ROCK. Catholics have that scripture totally wrong. All through Scripture Christ is a “stone of stumbling”, or the Rock. Christ is the Rock mentioned here, not the Peter.
And P.S. Peter HAS NOT THRONE. Only The Father sites on the throne in Heaven at this time. Jesus sits at His right hand. NOT Peter. And it will never be Peter.