>>”Upon this rock (of faith) I will build my church.”<<
“Upon this rock (faith in Jesus) I will build my church”. There fixed it for ya.
Jesus was the rock, the cornerstone on which the church (body of believers, not an organization) is built.
I’m not sure how you read that post but if you re-read it you will notice I put the quote I am responding to at the top. I was responding to the belief that Peter was the first “pope”.