You wrote:
“I don’t understand your question -——”
You should since you brought up the point. Here, let me help you. You wrote in post #13: “Also can you show us there in the Book of Acts where Peter was ever in Rome, or is all that mythology about him being the first bishop of Rome been withdrawn yet by your magisterium??”
I then asked you in post #24: “Can you show me where exactly it is part of the magisterium that Peter was the “first bishop of Rome”? I’m just curious.”
It's Roman Catholic Tradition. Asking if Catholics believe that Peter was the 1st bishop of Rome is like asking if the Pope is Catholic. Check New Advent or any Catholic website.
I believe the first to make the claim that he was the first bishop of Rome was Eusebius followed by Jerome. Both claimed that he became bishop of Rome in the 2nd year of Claudius [42 AD] and held the sacerdotal chair for 25 years until the 14th year of Nero [67 AD] --- all of which stretches credulity to such an extent that even the Catholic Encyclopedia has backed away from their claims.