Christ is the Rock that the church is built on, not Peter.
Nobody thought that was was what Jesus was referring to until some “enlightened” people came up with that idea in the past few hundred years. Find one historical reference to one sect/denomination anytime that believed what you are saying in relation to Matthew 16:18-20. It is made up and a fabrication.
Yeah, sure, and by applying that Lego Block Method of Scripture Interpretation along with frequent references to personal preferences, those who worship their own, Most High and Holy Self claim:
Matthew 4:4 Who answered and said: It is written, Not in bread alone doth man live, but in every word that proceedeth from the mouth of God.
means "every written word",
James 2:24 Do you see that by works a man is justified; and not by faith only?
means, "by faith alone", and that
Matthew 26:26 And whilst they were at supper, Jesus took bread, and blessed, and broke: and gave to his disciples, and said: Take ye, and eat. This is my body.
means, "this is is a symbol for my body but I'm too stupid to say what I really mean".
People who will twist and torture Scripture that way love darkness rather than light and will do whatever it takes to avoid the light. Like fleeing from a crucifix the same way 'B' movie vampires do. All anyone can do for them is pray for them because they only love and worship their own, Most High and Holy Self. Sad, but true.
And by the by, Christ is the Cornerstone and the Apostles are each foundation stones in the foundation. That's explicitly stated in Scriptue although those enamored of various heresies tend to pretend they never happened across that passage and then change the subject right away.
have a nice day
"Understanding this first, that no prophecy of scripture is made by private interpretation. For prophecy came not by the will of man at any time: but the holy men of God spoke, inspired by the Holy Ghost." 2 Peter 1:20-21
"And account the longsuffering of our Lord, salvation; as also our most dear brother Paul, according to the wisdom given him, hath written to you: As also in all his epistles, speaking in them of these things; in which are certain things hard to be understood, which the unlearned and unstable wrest, as they do also the other scriptures, to their own destruction." 2 Peter 3:15-16