His Church is the entire Body of Christ, not any one denomination, but all of us who have Christ as Lord and Savior. He may be a Godly man but he’s no more Godly than any other child of God. His purpose in life may be as your Pope, but many others glorify God with their purpose in life as well.
Whenever Christ speaks of His Church, it is always in the singular. Christ didn’t say, I have built my churches nor did He say, Hear the Churches.