"Without the infallible authority of the Church, the Church would be hopelessly divided on matters of doctrine and morals. This would not be the Church that Christ started.
The idea here is that when doctrine is left to the “private interpretation” of the individual, this leads to doctrinal anarchy. Catholics and Orthodox alike often appeal to the thousands of Protestant denominations as a witness against the doctrine sola Scriptura.
There are a few problems that I see with this argument. I will deal with the first to in brief and spend more time on the last one in the post that follows.
Problem 1: We don’t advocate “private interpretation”
This argument often assumes that sola Scriptura promotes an unbridled “private interpretation” that gives no authority to tradition. This is not the confession of sola Scriptura, but of nuda Scriptura, which I have spoken about previously. Advocates of sola Scriptura do not believe in this sort of private interpretation. We must interpret the Scriptures along with those who have gone before us, even if we might have warrant to question or disagree with their theology from time to time. Those who read the Scripture, as Alexander Campbell once advocated, “As if no one has read them before” are not following in the tradition of the Reformed view of sola Scriptura. Those must be judged on their own merit without association to the doctrine of sola Scriptura.
Problem 2: Everyone has divisions.
Protestants disagree about what the Scriptures say, Catholics disagree about what the Church says, and (as the saying goes) the Orthodox don’t say enough to disagree! Simply because one is put under a more definite designative umbrella does not make true unity. I, for example, have witnessed just as many disagreements among Catholics about what the Church means by “outside the Church there is no salvation” as I have among Protestants about any issue. All one has to do is to go spend some time on the Catholic Answers forum and see that they don’t function with much more unity than a Protestant forum. There would seem to be just as many disagreements, differing interpretations, and needless anathmatizing among Catholics as among Protestaants. The point is that simply because one functions under a unified name or confession does not mean that you have a unified belief.
It is agreed, however, that Protestants tend to have more divisions, but I would not say that this is the case with Evangelicals to the same degree as other Protestant traditions."