Below is an excerpt from Catholic Answers which provides a fictitious conversation between a Catholic and a Protestant - a training tool for Catholics. This article displays the true intent behind the whole canon argument for the Catholic apologetists/e-pologists (as I mentioned previously, it is all about bringing you under submission to Rome) and is why so many Catholic e-pologists won't let this one go.
Here the missionary will fumble around awhile, perhaps repeating his earlier statements. Then you say:
"Look, the fact is, the only reason you and I have the New Testament canon is because of the trustworthy teaching authority of the Catholic Church. As Augustine put it, ‘I would not believe in the Gospels were it not for the authority of the Catholic Church’ (Against the Letter of Mani Called "The Foundation" 5:6). Any Christian accepting the authority of the New Testament does so, whether or not he admits it, because he has implicit trust that the Catholic Church made the right decision in determining the canon."
"...Furthermore, the reason you accept the books you do is that they were in the Bible someone gave you when you first became a Christian. You accept them because they were handed on to you. This means you accept the canon of the New Testament that you do because of tradition, because tradition is simply what is handed on to us from those who were in the faith before us. So your knowledge of the exact books that belong in the Bible, such as Philemon and 3 John, rests on tradition rather than on Scripture itself!"
"The question you have to ask yourself is this: ‘Where did we get the Bible?’ Until you can give a satisfactory answer, you aren’t in much of a position to rely on the authority of Scripture or to claim that you can be certain that you know how to accurately interpret it."
"After you answer that question—and there’s really only one answer that can be given—you have some other important questions to ask: ‘If the Bible, which we received from the Catholic Church, is our sole rule of faith, who’s to do the interpreting?’ And ‘Why are there so many conflicting understandings among Evangelicals and Fundamentalists even on central doctrines that pertain to salvation?’" Catholic Answers
I will try to address the breakdown in this argument in a future post.