Matthew 16:18 And "I say also unto thee, That thou art
Peter, and upon this rock I will build My church; and the
gates of hell shall not prevail against it.
The name Peter does mean rock but he was not the rock the church was founded on. Peter was a movable rock.
"This", in upon THIS rock, is referring to Jesus Himself, The Rock, the foundation stone. Peter was neither the foundation nor the builder. Our church is founded on Christ, Son of God, not on a man.
We've gone through this on other threads. Are you even aware of the translation for Peter?
And Christ was talking about his Church, the Catholic Church, which has withstood over 2 millenia of attacks and is still here. Remember he gave the keys of the kingdom to Peter and said, "the gates of hell shall not prevail against it." (Don't think I've gotten my scripture passages mixed up here.)
The Church was founded by the Lord on Peter and his confession. Other denominations have been founded by men from the early 16th century onward.
The grammar doesn't line up for Christ to be speaking about himself - he's speaking to Peter.