An (undocumented) quote by Matt:
The advantage of sola scriptura is that it, via proper exegetical study, refutes the above heretical views, and supports the views that are Biblically based. It weeds out false doctrine such as that contained within the RCC, Anglican, Orthodox, and many others that you stated above. Lest you become offended, Matt, if I thought that either Anglican or Orthodox had all the correct doctrine then I would convert to either one of those religions wouldn't I? But they don't. They hold to various false doctrines. Doctrines which can be proven wrong via sola scriptura.
Since (as Brian as noted), we are more familiar with RCC doctrine, it is easy to take such doctrine and hold it up to the standard of Scripture and see whether it will stand or fall. In most cases it falls. Purgatory is a good example of that. What does the Bible say about this?
Isaiah 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
"No light" is a strong phrase. It appears that (generally speaking) there is no light in the RCC, for when their doctrines are tested via sola scriptura, they fall. They cannot stand. The RCC do not speak "according to this Word," that is the Bible, as this verse is applicable to our times today.
This Tradition, as it has historically been called, in addition to ‘filling in the gaps’ where Scripture is silent, also helps to explain and interpret Scripture for us, to assist us in arriving at the correct understanding of what the Scripture means. For we see the pernicious effects of using Scripture as the sole rule of faith and doctrine all around us in the divisions which plague the Body of Christ referred to above. These problems are nothing new to Christendom and gave rise to the famous test of sound doctrine coined by Vincent of Lerins in the 5th century: "Quod ubique, quod semper, quod ab omnibus" - "that [which has in relation to Christian doctrine been believed] everywhere, always, by everyone." In fact, I think that Vincent came out with a number of excellent points which are worth quoting in expanded format here from his Commonitory (here, ‘catholic’ simply means ‘universal’):-
“I have often then inquired earnestly and attentively of very many men eminent for sanctity and learning, how and by what sure and so to speak universal rule I may be able to distinguish the truth of catholic faith from the falsehood of heretical pravity; and I have always, and in almost every instance, received an answer to this effect: That whether I or any one else should wish to detect the frauds and avoid the snares of heretics as they rise, and to continue sound and complete in the catholic faith, we must, the Lord helping, fortify our own belief in two ways; first, by the authority of the Divine Law, and then, by the Tradition of the catholic church.
"But here some one perhaps will ask, Since the canon of Scripture is complete, and sufficient of itself for everything, and more than sufficient, what need is there to join with it the authority of the Church's interpretation? For this reason,—because, owing to the depth of Holy Scripture, all do not accept it in one and the same sense, but one understands its words in one way, another in another; so that it seems to be capable of as many interpretations as there are interpreters. For Novatian expounds it one way, Sabellius another, Donatus another, Arius, Eunomius, Macedonius, another, Photinus, Apollinaris, Priscillian, another, Iovinian, Pelagius, Celestius, another, lastly, Nestorius another. Therefore, it is very necessary, on account of so great intricacies of such various error, that the rule for the right understanding of the prophets and apostles should be framed in accordance with the standard of ecclesiastical and catholic interpretation."
The advantage of sola scriptura is that it, via proper exegetical study, refutes the above heretical views, and supports the views that are Biblically based. It weeds out false doctrine such as that contained within the RCC, Anglican, Orthodox, and many others that you stated above. Lest you become offended, Matt, if I thought that either Anglican or Orthodox had all the correct doctrine then I would convert to either one of those religions wouldn't I? But they don't. They hold to various false doctrines. Doctrines which can be proven wrong via sola scriptura.
Since (as Brian as noted), we are more familiar with RCC doctrine, it is easy to take such doctrine and hold it up to the standard of Scripture and see whether it will stand or fall. In most cases it falls. Purgatory is a good example of that. What does the Bible say about this?
Isaiah 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
"No light" is a strong phrase. It appears that (generally speaking) there is no light in the RCC, for when their doctrines are tested via sola scriptura, they fall. They cannot stand. The RCC do not speak "according to this Word," that is the Bible, as this verse is applicable to our times today.