I'm happy to accept that Paul did not pen all the words written in his name. If one reads the opening verses of Romans 1, it is clear that Paul is an apostle called by Christ, and that it is he who speaks the words that are recorded. It begins 'Paul, a servant of Jesus Christ, .....[verse 7] To all that be in Rome, beloved of God...'
Allowing the scribe to anounce himself later [16:22] simply adds to the authenticity of the testimony.
In then suggesting that Paul was a sinner, even after receiving Jesus Christ as his Saviour [1 Timothy 1:15], is clearly an intentional misrepresentation. One only has to read the verse that follows to gain a better understanding
1 Timothy 1:16. 'Howbeit for this cause l obtained mercy , that in me first Jesus Christ might shew forth all longsuffering, for a pattern to them which should hereafter believe on him to life everlasting.'
In Psalm 89:14 it says, 'Justice and judgment are the habitation of thy throne: mercy and truth shall go before thy face'.
God's mercy and truth 'shall go before thy face'. Who do you think is the face of God?
I can pen that X is a daughter of the devil. It does not make it true. As for an intimate of Paul, writing that Paul is an apostle, and of course that being according to Paul, that would make it "untrue" for a self witness is "not true" per Yeshua in John 5:31.
You can say Lord, Lord, and do miracles in my name, but in the end, you are not "saved", and Yeshua will tell you , "I never knew you; Depart from me, you who practice lawlessness" (Matthew 7:22). Well, Paul's message is one of that the Law is obsolete, and you can do what ever I say you can do, such as I am a Gentile to the Gentiles, but a Jew to the Jews. It is a message of appearance and not of substance. And as you quoted, it is justice and judgment that are paramount, which is to say, everyone is judged on their deeds, and not on their false perceptions. (Revelation 20:12).
And if Yeshua was the "Word" made flesh, the "Word of God", how is it you believe in him, if you nail his message to the cross? I think you have some problems with your message, and with the messenger who brought you your doctrine.
Keep in mind that those with the "mark of the beast", will drink from the cup of God's anger (Revelation 14:10). And the "day of the Lord" is "right at the door" (Matthew 24:33). You might want to do a deeper search for "truth", and what "mercy" means in the present context. As for Paul's Lord, when in trouble in Jerusalem, he called on his lord, Caesar, with his cohorts, to save him.