Sola Scriptura (Bible alone) is not a coherent doctrine

I apologize but it seems as though the word Salvation is becoming completely over complicated to no longer hold its definition. Salvation is the saving of the soul from sin and its consequences. Christianity claims that putting your faith into Jesus to simply mediate salvation on your behalf after dying on the cross so that it may be so, is all that you need to have Salvation. No added book would ever change that in any circumstance, unless it refutes the very words of Jesus. I would in fact personally say you do not even need the Bible, but one Gospel, seeing how the rest of the New Testament is theology on Jesus and prophesy whereas the Old Testament only explains God's relationship with man, where we came from and prophesy on the one who would come who would save all from there sin. There is modern theology however which is inspired by, quotes, and explains the Bible. The only added doctrines to the Bible are made by the Popes of the Catholic Church (which the debate of whether or not he is infallible has torn the Church in two, then again to tens of sects) and books that contradict things written in the traditional Bible. For example the Book of Mormon, adding on countless doctrines to Christianity and stating that Jesus came to America even though it came out of his own mouth that he was here only for Israel. Another example is the Book of Thomas which was written by Gnostic Christians. Groups of Christians do not claim most of these books because their doctrines contradict the doctrines of the traditional Bible which was written by disciples of Christ & the apostle Paul and Jews. And concerning your question on the possibility of another book or document containing something else necessary for salvation, Christians believe they are helpless for their own salvation since their very actions condemn themselves. The only way to find salvation is to have faith that it will be granted to you by the only one who can give it. I understand where the question came from however. Modern theologians discover more things about us and our relationship with God everyday. If you ever were to read modern theology it explains how salvation works, what connections there are to the Bible and the issues our generations and cultures are having with obtaining salvation. Although theology explains salvation for someone to better understand it and even obtain it easier, it isn't needed enough to add more scripture since the answer of what salvation is, why it exists and how to obtain it are all within the Bible. 1) The Bible can't claim to only use the Bible because it was never compiled together when it was written. It does however put emphasis on looking to "the Word of God"/scripture which were the popular books from the Old Testament which in a sense was the Jews own S.S. only not bound together. (Before its argued I will say there is no quotation in the New Testament that does not refer to a book possessed in the Old Testament [except in James which many scholars claim, when translated correctly, was not meant to be taken as a quote from scripture] (and before that is argued, there are no books in the New Testament era that aren't in the traditional new testament, except of course the books with contradicting doctrines)) 2) Well first understand how the Bible was compiled. The popular books were put in the Bible and debated on which were necessary. How did the Jews know what Scripture was important for salvation? It was chosen by the people, which by the way weren't chosen based on what sounded good. Jews cared only about the truth and it was all they looked for when consulting what they believed was the true Word of God. 3) And yet it was you who said non-biblical text did not matter. "Now there are other extra-Biblical texts that confirm the Bible. But still, this doesn't matter because who is to say that these don't belong in the Bible? Don't the Biblical texts confirm each other?" All you need for salvation is the Bible and all you need to confirm your faith if you ever wished to were the non-biblical texts. But this isn't about whether or not Christianity is true? 4) Looking at different denominations, don't confuse tradition with doctrine. There are many things both churches can argue against saying the other is not following the Traditional Bible. And yes, (concerning the different cultures and edits of the Bible), most Christians understand the Bible is inspired by God and written by man. Not spoken by God through man. And concerning whether or not God revealed himself in a manner that was cryptic, I most certainly don't believe he revealed himself in a manner that all can believe easily with 100% faith. But back in the Jews time, if you believe their stories to be true, yup he was cryptic back then as well. Why do you think the Israelites left Egypt with Moses, saw the water and flipped off God thinking he sent them to die?