Well, in that case you will have to discount the entire Bible- wouldn’t you? Since the books in the Bible were carefully sorted out by the early Church fathers and they used the oral tradition to fact check some written works with others as to what were authentic. Some tracts like the Gnostic Gospels etc were thrown out and others were included. You must therefore ignore the Bible because by your own lights “ how could you ever determine if some other was properly interpreting the Scripture -— or not?”
Catholics resort to Petrine authority, what is yours?
That's something of a non sequitur, while also deflecting the burden upon my own self for things which you have just established that you yourself have no actual 'authority'.
In regards to formation of NT canon, you say such things as;
while seeming to make things out to be that this was established by this "Petrine authority" which you keep returning to make mention of.
Yet the canon of the NT was not established through the singular office of the bishop of Rome --- which it would have had to have been -- if this "Petrine authoirty" concept which you hold (and just how you and many other Catholics "hold" it to be) were to have any validity in this area.