Peter was first, Bishop of Antioch. Later on he was Bishop of Rome.
There is no record in the Bible or elsewhere, of Peter issuing instructions to the diocese of Rome. What an amazing oversight by a supposedly infallible commander-in-chief! In addition to that, Paul wrote to Timothy from Rome.
2 Timothy 4:9-12 - "Do thy diligence to come shortly unto me: For Demas hath forsaken me, having loved this present world, and is departed unto Thessalonica; Crescens to Galatia, Titus unto Dalmatia. Only Luke is with me. Take Mark, and bring him with thee: for he is profitable to me for the ministry. And Tychicus have I sent to Ephesus."
Where was Peter the supposed Bishop of Rome? Again in 2 Timothy Paul is giving instructions to Timothy. If Peter was the Supreme Pontiff of Rome why is Paul writing from Rome with no mention of Peter?
Then there is Irenaeus.
Irenaeus: "The blessed apostles, then, having founded and built up the Church, committed into the hands of Linus the office of the episcopate. Of this Linus, Paul makes mention in the Epistles to Timothy. To him succeeded Anacletus; and after him, in the third place from the apostles, Clement was allotted the bishopric. . . . . To this Clement there succeeded Evaristus. Alexander followed Evaristus; then, sixth from the apostles, Sixtus, was appointed; after him, Telephorus, who was gloriously martyred; then Hyginus; after him, Pius; then after him, Anicetus. Sorer having succeeded Anicetus, Eleutherius does now, in the twelfth place from the apostles, hold the inheritance of the episcopate. In this order, and by this succession, the ecclesiastical tradition from the apostles, and the preaching of the truth, have come down to us. And this is most abundant proof that there is one and the same vivifying faith, which has been preserved in the Church from the apostles until now, and handed down in truth (SOURCE: Iraeneus Against Heresies, Volume I, Book III, Para 3)
Did you notice that it was Paul who made mention of Linus, not Peter? With no indication of Peter ever being in Rome nor any indication that Peter in fact was the head of the Apostles there can be no legitimate claim that Peter was the first Pope or that the RC was built on Peter.
And then one more embarrassment for the RCC. In the 1950s Roman Catholic archaeologists discovered a tomb in Jerusalem containing an ossuarya bone box used in first-century Jewish burialsthat bore the engraved name Simon Bar Jona (a name by which the apostle Peter is known in the Gospels).
The RCC has erroneously interpreted one verse of scripture to try to wrest control of Christs church and then tried to manipulate scripture for hundreds of years until those interpreting from the original languages found gross errors in the RCC manuscripts which precipitated the Reformation.