Then I must ask, what was Paul's gospel?
Romans 2:16 - on the day when, according to my gospel,
Romans 16:25 - Now to Him who is able to establish you according to my gospel
2 Timothy 2:8 -Remember Jesus Christ, risen from the dead, descendant of David, according to my gospel,
Once you find what Paul's gospel was, then please show me where Jesus and the disciples preached the same gospel.
Where do we find a warning not to deny the authority of scripture? I believe we are told to test a prophet's words to see if he speaks for God or for himself. Is Paul exempt, while every other prophet (genuine or fake) has been tried by this test.
It's not wise to take a man's word, especially if he speaks for God, with blind abandonment.
I'll give you one: Do not work for the food which perishes, but [work] for the food which endures to eternal life, which the Son of Man will give to you, for on Him the Father, God, has set His seal (John 6:27).
What you forget to add, nowhere does Jesus say faith without works will save you. In fact, James, who was with Jesus during His entire ministry made it clear to all who will hear, faith without works will not save you. Jesus' whole ministry was about faith, love, works, and obedience for salvation.
Why would one not want to heed the Savior's words, which are eternal life? Why would one want to trust their very soul to a man who admitted to lying and deception, without testing him?
Listen to these words of Jesus in Luke 13:
23 Then one said to Him, Lord, are there few who are saved?And He said to them,
24 Strive to enter through the narrow gate, for many, I say to you, will seek to enter and will not be able.
25 When once the Master of the house has risen up and shut the door, and you begin to stand outside and knock at the door, saying, Lord, Lord, open for us, and He will answer and say to you, I do not know you, where you are from"
Notice Jesus was asked about salvation (v.23). His reply was to strive (contend, labor fervently) to enter the narrow gate. Many will seek to enter and not be able. Why? They didn't strive to enter. They thought they could enter on some other easier, and more comfortable terms (faith alone with no works nor striving). But Jesus will say to them, "I DO NOT KNOW YOU, WHERE YOU ARE FROM"
Since Jesus is the Savior Himself, I think it would be wise to hear His words and heed them. Don't trust your soul to a man who disagrees with Jesus' words of life.