"And I tell you that you are Peter, and on this rock I will build my church, and the gates of Hades will not overcome it." --Jesus
"And if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector." --Jesus
"if I am delayed, you will know how people ought to conduct themselves in Gods household, which is the church of the living God, the pillar and foundation of the truth." --St. Paul
"I have given them the glory that you gave me, that they may be one as we are one I in them and you in meso that they may be brought to complete unity. Then the world will know that you sent me and have loved them even as you have loved me." --Jesus
Matthew 16:18 is misinterpreted by catholics. Peter was another disciple of Jesus like the others.
Jesus’ church, His body of believers, is built on His sacrifice and His revelation to the minds and spirits of believers by the Holy Spirit. He said that Peter was blessed because he received knowledge of who Jesus is through revelation of the Spirit. The Holy Spirit had not yet been given to the saints (who are simply believers in Christ). Jesus was declaring that His church would be based on spiritual revelation from God.
If you look just a few verses later in the same chapter, Jesus rebukes Peter (calls him Satan, in fact) for not accepting that Jesus would have to go through his terrible death to defeat death.
My couple of comments last night were to my husband (who was raised catholic, but is now a Bible-believing Christian instead). I did not intend to argue with catholics, because that only wastes everyone’s time. I don’t intend to argue with catholics today, either—just this comment to you and one other who wrote last night.