Is there a question for me in this?
Not really unless you are among those who believe that Peter was the ROCK the Church was built upon.
I am not a Catholic, as my posting history would clearly show you but I do not believe that ANYONE honestly believes that Peter was made of stone, and that a Sanctuary was physically built on top of him.
Or did I misunderstand you? Are you saying that if Christ IS the church, why would he build on a fallible mortal man?
If that was your meaning, I apologize for my misunderstanding.
As a child I was taught that Peter was the Rock upon which the Church was built. Many Catholics, to this day, believe Peter was that Rock.
I posted the Catechism to show this is not the "Official" teaching of the RCC.