James Swan (the original poster) is commenting on this thread with his peers over at his blog. Even though no Catholic here answered his question this way, here is what Swan concluded:
The truth is, the infallible list of ex cathedra papal statements exists nowhere within what Rome calls her three sources of revelation: the Bible, the Magisterium, and Tradition, leaving the faithful to struggle through this issue, groping blindly on their own. In fact, their own teachers will not and cannot tell them.*Did anyone in this thread say they were “groping blindly”? Was there any mention that the average lay person is not obligated to identify which statements are technically infallible? Was there any mention that Catholics make an assent to authoritative statements on faith or morals whether or not they are technically “infallible”? No, no, and no.
Swan’s problem is that he thinks a Catholic must scruple about this issue. Can you imagine a non-Catholic Christian arguing that the Bible is fallible because someone “struggles” with a truth contained in it—thinking that a said truth is not clear enough? Is the truth something that has been fulfilled and no longer applies? How can a Christian be sure what to believe! Swan’s logic flows thusly: if the Catholic Church teaches an infallible dogma, the average person will always be able understand it without a doubt. Now do a substitution: if the Bible teaches an infallible dogma, the average person will always be able to understand it without a doubt. Not logical.
I would argue the doctrines put forth by the Catholic Church in, say, a summary for the laity like the Catechism are usually more clear than the language of Scripture itself, which self-admittedly is twisted by the unlearned and difficult to understand. Bottom line, the Church is doing Her job, receiving the movement of the Spirit, and unfolding the faith to the flock.
If I may posit, Swan’s insinuation is that if an average Catholic cannot in his own mind have metaphysical certitude that a doctrine has been stated “infallibly,” then that Catholic has a good reason to worry that the doctrine is
wrong because infallibility does not operate by the rules he has ordained for it. The conclusion does not draw from the premise. He offers no mention of the Catholic’s faith in God to guide the Church on His time and terms. He offers no due time spent on the nuance of of a teaching that is potentially
de fide, fides ecclesiastica, sententia fidei proxima, etc…
On a positive note, a blogger known as Scott Windsor has challenged Swan on a debate on Tradition. That challenge
can be followed here.
*Swan errs here. The Church only teaches 2 sources of revelation flowing from the same “divine wellspring.” The Magisterium is the interpreter of said revelation, not its source (Dei Verbum 9-10).