Since this is my first post to you, let me say "Welcome to our forum!"
I thought I'd jump in here while we're waiting for Rose to find time to answer.
Your question makes me think of this verse:
Paul said that the church is built on the foundation of the "the foundation of the apostles and prophets" with "Jesus Christ himself being the chief corner stone."Ephesians 2:19-22 19 Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God; 20 And are built upon the foundation of the apostles and prophets, Jesus Christ himself being the chief corner stone; 21 In whom all the building fitly framed together groweth unto an holy temple in the Lord: 22 In whom ye also are builded together for an habitation of God through the Spirit.
Was Peter an Apostle? Yes.
Was Peter a Prophet? Yes. He wrote Holy Scripture.
Did Jesus say that he would build His Church upon Peter? Yes, that is the most literal and natural reading of the passage. The word play between Petros and petra is inescapable, and there is no indication in the text that Peter's confession should be taken as the antecedent of "this rock." If that were Christ's true intent, then we must ask why He made it seem otherwise.
Do all these answers cohere? Yes.
Do these interpretations of Matthew 16 and Ephesians 2 cohere? Yes.
The interpretation you offer does not flow naturally from the text. It appears to have been invented by Protestants to counter the claims of the Catholics. I don't think we should let a squabble between Christians determine how we interpret the Bible. We must look to the Bible for the truth. We must be careful not to twist it to fit our own agendas. We must never let our prejudices color what we read. I sincerely doubt that anyone ever would have invented that novel interpretation of Matt 16:18 if not for the battle with the Catholics. We must always be on guard against letting such things influence our interpretation of Scripture.
Of course, I don't think Matt 16:18 justifies the Catholic claims in any way at all. By their fruit ye shall know them. I need no contrived biblical argument to recognize the errors in the Catholic church.