Guanophore, thanks for the feedback as well as for your own contributions to the discussion at hand.

And I now agree that the topic of the validity of Sola Scriptura is relevant to the thread. Therefore…
To everyone who is participating in this thread, I offer my list of objections to the validity of Sola Scriptura to ponder:
1) Sola Scriptura is not actually taught in Scripture, and it could
easily have been, considering all the time, people and text that went into compiling the Bible. If God wanted us to follow the rule of Sola Scriptura, why not simply have ONE prophet devote ONE line of Scripture to state something like, “Scripture alone is to be the basis of formulating doctrine”? There are thousands and thousands of verses in the Bible. If only ONE of them contained such a statement then all Christians would be adherents of Sola Scriptura.
2) Sola Scriptura is a teaching that tells us to use Scripture alone when formulating doctrine. But Scripture alone cannot be used to validate Sola Scriptura. In other words, in order to demonstrate why Sola Scriptura is true, one has to make arguments
outside of Scripture. This means that the proposal violates the Law of Non-contradiction, because Sola Scriptura fails its own test (i.e., it is a teaching outside of Scripture that says to reject teachings outside of Scripture).
3) Sola Scriptura is not self-evident. Approximately
4000 years have passed since God established the covenant with Abraham, and yet the Jews have never gleaned Sola Scriptura from Scripture, nor taught it. The closest thing we see in Judaism were the Sadducees who taught “Torah Only” (but they did not get this rule from Scripture itself, and their stance on “Torah Only” led them to disbelieving in a resurrection and afterlife for humans; Jesus corrected them and thereby demonstrated disapproval of their “Torah Only” principle).
Moreover, Catholic and Orthodox Christians have been around for approximately
2000 years, and yet neither the Catholic Church nor any of the various Orthodox Christian Churches have ever taught Sola Scriptura. In light of all this, literally billions of Scripture-using people have been around for 4000 years who never believed in nor taught Sola Scriptura, nor saw evidence of it in the Bible.
Moreover, many adherents of Sola Scriptura disagree over the definition and application of Sola Scriptura, making it questionable as to exactly how self-evident it is even to them.
4) Adherents of Sola Scriptura reject the authority of the Magisterium, and yet it is by the authority of the Magisterium that Christians accept what books belong in the Bible (i.e., the Canons of the Old and New Testament). For example, many ancient Christians thought that the
Letter of Barnabas and the
Books of Enoch were divinely inspired. And yet no Christian Bible today contains them. Who told us that these books were not truly divinely inspired? God did. And how did God tell us? Through the Magisterium. So in order to be a practitioner of Sola Scriptura, one first has to ask what is and is not truly Scripture to begin with. To answer that question, Christians have relied upon what was determined by the Magisterium. But if one rejects that the Magisterium has the God-given authority to do such things, why believe in the Canons of the Old and New Testaments formulated by the Magisterium? The question remains,
“What exactly are the Scriptures that are alone supposed to be used in order to practice Sola Scriptura?” (As a side note, I know that Protestants and Catholics disagree over the Deuterocanon of the Old Testament, so I am simply speaking in general terms here).
5) We have no original manuscript of any book in the Bible, but only copies of copies of copies, and so forth. Adherents of Sola Scriptura reject the authority of the Magisterium, and yet it is by the authority of the Magisterium that Christians accept that the ancient biblical manuscripts truly represent what was originally written. For example, how do I know that the Gospel of Luke in my Bible is a true representation of what Luke actually wrote, seeing as his original version has been lost since the time of the ancient Church? God verifies that it is. And how did God verify it? Through the Magisterium.
6) Sola Scriptura has not proven useful in resolving doctrinal disputes among Protestants over such topics as the Real Presence in the Eucharist, women pastors, the necessity of water Baptism, homosexual marriage, divorce, abortion, what is and is not a sacrament, etc. These are not small issues, and many people come up with contradictory statements about them, with each side citing that their position was derived from Sola Scriptura.