If only your criteria for the foolishness of sola scriptura were so high!
The only Gentiles mentioned in the bible he preached to was Cornelius and his household.
All Scripture is inspired and truth so you must go to the letter to the galations
Gal 2:7 But contrariwise, when they saw that the gospel of the uncircumcision was committed unto me, as [the gospel] of the circumcision [was] unto Peter;
Gal 2:8 (For he that wrought effectually in Peter to the apostleship of the circumcision, the same was mighty in me toward the Gentiles:)
Gal 2:9 And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we [should go] unto the heathen, and they unto the circumcision.
pronounces the dogma that James, the Bishop of the See of Jerusalem, who would be responsible for annunciating a decision of a council held there confirms
He addressed the council, without personal authority or power. James as the head of the council made the declaration .Peter participated but he was not the leader, or head. After this we NEVER hear of Peter again.
, he preaches in Babylon, which is universally (at least until the Reformers and their heirs found it inconvenient) believed to be Rome, where his bones are,
Well it is interesting that Catholics believe that Babylon is Rome and the church there huh? LOL if I said it I would be called anti Catholic .
Rev 14:8 And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.
Rev 18:2 And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
Please present a contemporary writing that places Peter in Rome at any time