Those who follow this blog (and my comments) know that I am a huge fan of Biblical exegesis, that is making apologetics arguments from properly interpreting Scriptural texts. Everyone is well aware that Protestants like to parade around holding up the Bible as if it is their trusted book for guiding their paths, but over the years I have come to see how utterly false and deluded this attitude is. In reality, it is just the opposite: Catholics are the ones who base their teachings from Scripture, while Protestants do not. And any Truth in Protestantism was already considered Truth in Catholicism, so it follows that any uniquely Protestant doctrines are unscriptural by this very fact. Since Protestants do not follow Scripture alone but rather traditions of men, Catholics need to start insisting the term "Sola-Scriptura" is inaccurate and rather opt for the more correct slogan: "Sorta-Scriptura". I say this for the same reason that Catholics should stop granting Protestants the use of the term "Reformation" when in reality what happened was a DEformation. St Francis de Sales (patron of this Blog) was even in the regular habit of calling Luther and Calvin "Pretend Reformers," because they didn't do any genuine reforming at all.
What does Sorta-Scriptura mean? It means Protestants "sort-of" follow Scripture. Throughout Protestant history they have had good insights to various texts when defending traditional Catholic teachings, so this should not be discounted. In those situations, Protestants are following Scripture. But when it comes to unique Protestant teachings (including Sola Scriptura itself), most Catholics have no idea just how embarrassingly shallow the Protestant proof-texts are. Take the widespread doctrine of The Rapture as one prime example: the chief Protestant proof-text is 1 Thessalonians 4:15-17, which they claim teaches that Jesus will "take up" (Rapture) all true Christians just prior to the Great Tribulation in order spare them the suffering it will entail. Yet this passage indicates no such thing, instead it is plainly talking about the very end of the world, when Jesus returns and separates the Sheep from the Goats to judge them (Matthew 25:31-46). Can you believe that millions of American Protestants (including many with Ph.D.'s) actually believe in the Rapture and think that there is all this great Biblical proof for it? Or take another example, the Reformed teaching that Christ, in our place, kept all the commandments we were required to keep: their chief proof-text is Romans 5:19, yet the "obedience" mentioned here says nothing about keeping the commandments for us. Rather, when the Bible uses the term "obedience" in reference to Christ, it is referring to Christ's sacrificial "obedience unto death" for us (Phil 2:8; Heb 5:8).
Other examples of significant Protestant doctrines being built on the most laughable of "Biblical foundations" are: the Baptist notion that Baptism is purely symbolic; the Anglican idea that the King of England holds a supreme leadership position in God's Church; the Lutherans name their church after Luther and give Luther a Popish status; the Seventh-Day Adventists say Ellen White is a prophetess and that Jesus judged the world in the year 1844; the Salvation Army rejects the Sacraments of Baptism & Communion; and the Pentecostals believe speaking in tongues is a ordinary rather than an extraordinary gift. The list could go on, but you get the idea.
The problem, in a nutshell, is this: Protestantism is not built on Divine Revelation, but rather on traditions of men, and so the Protestant mind first embraces the tradition of men and only then proceeds to "find" Biblical support for it. Catholics would do well to remind other Catholics and Protestants that Catholicism is the only Biblical religion while Protestants reject and denigrate the full teaching of Scripture. The Bible is a Catholic book, and the Catholics who know their Bible can easily trounce any Protestant of any denomination.