Yeah, thanks to various "Ligonier" teachers, I'm aware of this justification doctrine.
I wonder if you're aware of the justifications taught in Romans 2:6-16 (eschatological), or in 14:5,23 (moment to moment)? Or the fact that James says you're not justified by faith alone but by both having faith and by living out that faith?
Jas 1:1 James, a servant of God and of the Lord Jesus Christ,
to the twelve tribes which are scattered abroad, greeting.
Rom 2:1 Therefore thou art inexcusable, O man, whosoever thou art that judgest: for wherein thou judgest another, thou condemnest thyself; for thou that judgest doest the same things.
Who is the "O man?"
Rom 2:17 Behold, thou art called a Jew, and restest in the law, and makest thy boast of God,
Though it may be desirous to try and usurp some of Israel’s prophecies or promises, the natural reading of Romans 2:28-29 does not teach that the church today, where there is neither Jew nor Gentile, is spiritual Israel.
We can determine this first by establishing who the passage is addressing.
‘Thou Art Called a Jew’
“Behold, thou art called a Jew, and restest in the law, and makest thy boast of God” – Romans 2:17
Romans 2:17 indicates the audience of the passage as those that are called Jews.
He continues in the next three verses speaking about how the Jews were given the wisdom of the law.
So then, he that is called a Jew is the same who was given the oracles of God and was given the promises, covenants, and service of God (Romans 3:2, 9:4).
The target audience of the passage is physical Israel, those of the house of Jacob.
The Name of God Blasphemed
“Thou that makest thy boast of the law, through breaking the law dishonourest thou God? For the name of God is blasphemed among the Gentiles through you, as it is written” – Romans 2:23-24
As we continue through the passage we see that Paul starts to address a problem with his blessed nation Israel. Israel makes their boast in the law, but they fail to do the law. Israel the people named after God, have become as vain as the Gentiles given up by God in Romans 1 (Romans 1:24,26,28).
The Issue of Circumcision
“For circumcision verily profiteth, if thou keep the law: but if thou be a breaker of the law, thy circumcision is made uncircumcision. “ – Romans 2:25
When God gave the covenant to Abraham, he instituted circumcision as the token that Israel was keeping the covenant (Genesis 17:10-14). If they break the law then the token of keeping it is made worthless. The circumcision sign is made vanity and just as if they were uncircumcised.
“Therefore if the uncircumcision keep the righteousness of the law, shall not his uncircumcision be counted for circumcision? And shall not uncircumcision which is by nature, if it fulfil the law, judge thee, who by the letter and circumcision dost transgress the law?” – Romans 2:26-27
You see this?