Because the list of canonical books is itself not found in Scripture—as one can find the Ten Commandments or the names of Christ’s Apostles—any such list, whether Protestant or Catholic, would be an item of extra-Biblical theological knowledge. Take for example a portion of the revised and expanded Evangelical Theological Society statement of faith suggested by the two ETS members following my return to the Catholic Church. (The proposed change failed to garner enough votes for passage, losing by a 2-1 margin). It states that “this written word of God consists of the 66 books of the Old and New Testaments and is the supreme authority in all matters of belief and behavior.” But the belief that the Bible consists only of 66 books is not a claim of Scripture—since one cannot find the list in it—but a claim about Scripture as a whole. That is, the whole has a property—“consisting of 66 books”—that is not found in any of the parts. In other words, if the 66 books are the supreme authority on matters of belief, and the number of books is a belief, and one cannot find that belief in any of the books, then the belief that Scripture consists of 66 particular books is an extra-biblical belief, an item of theological knowledge that is prima facie non-Biblical.
Where have I gone wrong in this reasoning?