[MHGinTN]

You declared, "Since Scripture says Christ built His Church on Peter, I'd guess Peter was the first catholic", and as expected, you are wrong. JESUS and the belief in HIM as activating The Grace of God in Christ Jesus is the rock.

If Augustine explained it to you, would you reconsider your error?

[FatherofFive]

The Grace of God in Christ Jesus is the rock.

The Rock represents a few things in Scripture.

What language did Christ speak to the Apostles? Peter was called Rock by Christ. Calling Peter Rock showed the importance of Peter in starting and building his Church.

Read the plain words of Scripture to find the real meaning.