That does not mean that all words are of equal authority or value. Satan is quoted in Scripture. Do you give THOSE words the same value as the words of God? Of course not!
But WHY not?
Because the text TELLS YOU "Satan said...".
Likewise, all Scripture may be inspired by God, but God inspired the writers of Scripture to write down specifically when God was speaking, and when somebody else was speaking.
(Also, please note, God did directly tell John to take dictation in Revelation, and warned that anybody who changed a word of THAT written scroll faced damnation, so God himself, speaking in heaven, and speaking last, made the point quite explicit that some text is more authoritative than other text. He also made it clear whenever he himself speaks in Scripture.)
So, sure, all Scripture is "God-breathed", but IN Scripture God said that Jesus was his Son, and to follow HIM (not anybody else), and God inspired the writers of Scripture to always explicitly indicate when God was speaking.
So, you may have a tradition of elevating Paul's, and Peter's and James' and Luke's, etc., words to having the same authority as Elohiym's, and YHWH's, and Jesus', and God's angels, just because their words appear in Scripture. But Scripture itself tells you that's not so.
Satan speaks in Scripture. You don't listen to him because he's identified as Satan. Similarly, you DO listen to God, and God's Son, and give that higher authority, because God makes sure that he's always clearly identified when he speaks, so that there's no mistaking it.
Jesus and Paul appear to conflict in several places. When they do, you have to read Jesus and do what HE said, and then do the work at reinterpreting Paul until you read Paul to mean what Jesus said. That is the proper direction to read Paul - as permanently, and utterly, subordinate to Jesus in all things. Paul even tells you that point blank in the Scriptures ("Is there a gospel of Paul?" He asks. And answers NO!). Paul also tells you that he is the least of the Apostles.
Essentially, if you privilege Paul over Jesus, as several branches of Christianity do - always claiming, as they do it, that, because Paul was inspired, Paul's words ARE Jesus, and that where they appear to conflict - and they do - that Jesus CLARIFIED himself through Paul - then you end up nullifying a lot of what Jesus said for an easier path of simple pure belief, as opposed to deeds.
That could be a persuasive argument, except that God took the last word in Scripture by pulling John up to Heaven and DICTATING word for word his words in Revelation - and those words - about men being judged based on their DEEDS - lines up with what Jesus said, and contradicts what Paul appears to say that has been called "faith alone".
So no, Paul's words do not have the same authority as Jesus'. Yes, they are Scripture. No, every word in Scripture is not of equal authority. Satan's words are in Scripture, and clearly identified. So are God's words, and Jesus' words. God inspired the authors to specifically highlight His Own Words, for a reason - because HE is God, and the final authority.
Paul, James and John conflict in their letters. The Apostles conflict somewhat with Jesus over food. One can pretend they don't, by adding an extra-biblical tradition that "Scripture cannot conflict", but it does. And where it does, God has provided the easy way to identify the highest authority: Jesus' words are always quoted, and the Father, speaking from Heaven, said to a whole crowd: "This is my beloved Son, listen to HIM."
So, CAN Paul be read to say that deeds count at final judgment. Sure. But he can ALSO be read to say that what you do does not count, just what you believe. And Jesus said that is not true. So, given two possible interpretations, one is right, because Jesus said so. The other one is wrong, even though it is a plain read of Paul in Romans. Unfortunately, this misuse of Paul is the primary theological error that divides evangelical Protestants from Catholics and the Orthodox today.
Paul is Scripture, but he is confusing. Peter said that, and it is true.
The bottom line is the answer to the question: Do the deeds that you do in life determine your final judgment.
Jesus said YES THEY DO.
Paul is read to say, and in Romans and Corinthians seems to say on a plain read, no they don't, your faith is all that counts.
That read of Paul contradicts Jesus, and THEREFORE is false, because Jesus is God and Paul is not. In the event of apparent conflict Jesus Trumps Paul. Always. This really SHOULD be obvious. That it isn't is probably because what Paul says is a lot easier to do in real life than what Jesus says.
