Again, you haven't really read what Catholicism says of itself rather what others say of Catholicism.
The Bishop of Rome rests its authority on being the see of Peter AND Paul. both of them were martyred on the outskirts of Rome and they have basilicas to it.
Peter was not just sent to the circumcision - come on, as I said above, he baptised gentiles before Paul, he then went to Rome and was baptising gentiles there.
have you read 1 Peter? he addresses it to the gentile converts of Asia Minor
Thanks for your many replies. I don’t know where you came up with half of it or why you’re attempting to throw it into the mix at this point, but thanks just the same.