It rejects Sola Scriptura and Sola Fide
Please don’t take it the wrong way when I say this but, sola scriptura is one of the most baseless and nonsensical doctrines of the Lutheran and Reformed tradition, I just can’t see the logic in it. The Bible didn’t just fall from the sky, it was written over the course of about 1,000 years, and it took centuries more for a canon to be compiled. Furthermore, Christians can’t even seem to agree what should be Biblical canon. Orthodox follow the Septuagint exactly for the Old Testament, including chapters like Psalms 151 and all the deuterocanonicals (including the ones that even Catholics consider apocryphal), whereas Catholics follow the canon put forth by the fourth Council of Carthage (397 A.D) which includes several deuterocanonical books that are in the Septuagint, and Protestants follow the same canon as the Jews do for the Old Testament which omits all the deuterocanonicals. As for the New Testament, it is often thought all Christians agree on at least this, and for the most part that is true, there is indeed no difference between the Catholic, Eastern Orthodox, and Protestant New Testament, however, Ethiopian Orthodox do actually include 8 additional books in their New Testament canon. So how do we decided what is scripture and what is not? Easy. We listen to the Magisterium. That is the authority we have. The Magisterium also has the authority to interpret scripture. You wouldn’t have your Bible today if it wasn’t for the Tradition of the Magisterium. You do know that the idea of a Biblical canon is Tradition within itself right? You do know that before any of the books in the Bible were written, all their stories and teachings began as Tradition right? Scripture itself really is Tradition, it’s an extension of it, it’s Tradition that has been written down onto pieces of paper and made into a book. This is why Scripture and Tradition (with a capital ‘T’) are equal, because they’re essentially the same thing. This is why Scripture itself urges us to follow Tradition (1 Corinthians 11:2, 2 Thessalonians 2:15). You can’t just rely on scripture alone, that reasoning makes no sense!
As for the whole faith alone issue, this is one of the most misinterpreted issues of the Catholic vs Protestant debate. Faith alone centers around the Lutheran and Reformed ideas of monergism, whereas Catholics and Orthodox, as well as Wesleyan Protestants and some Anglicans, reject sola fide because we are synergistic. We put a great importance on the idea of free will in salvation, while Lutherans and Reformed Christians reject the idea of there being free will in salvation, teaching that God is doing all the work, and their is no cooperation. Synergist do not teach “work based salvation”, like monergist we agree that justifying grace is freely given and not based on works, but we believe in cooperation with God’s grace is necessary so that we may continue to grow in it and achieve full divinization, this is what we mean when speak about “merit” and works being necessary for salvation. Do you not know that God will judge each of us according to our works (Job 34:11, Matthew 16:27, Romans 2:6)?