I will agree that my english here is not the best - it is not clear what sense one can ascribe to the notion of "a law about ethnic exlusivity".
So to the charge of sometimes using bad phraseology, I plead "guilty". But, at worst, this statement of mine is unclear.
And what is relevant here is that it is not a statement that one can take the phrase "deeds of the Law" and replace it with the phrase Jewish ethnicity".
I will no longer waste time on this particular side-track - there is so much other incorrect exegesis that needs to be set straight.
For the record: "I, Andre, do not, repeat do not, suggest that one properly exegete Paul by taking the phrase "deeds of the Law" and replacing it directly with "Jewish ethnicity".
The terms "justification by the deeds of the law" mean OBEDIENCE TO THE LAW as the grounds for justification. It cannot mean DISOBEDIENCE to the law for justification as the law will not justify DISOBEDIENCE. Disobedience to the law is called SIN. Thus OBEDIENCE is called "righteousness." Obedience is called "good" works and DISOBEDIENCE is called "bad" works. Justification has to do with MORAL status before God. Therefore to deny that the phrase "justification by the deeds of the law" has no reference to what the Law regards as "GOOD" works is to deny the very concept of justification altogether as you have denied any moral basis for justification to occur by the law.
If you deny that the words "deeds of the law" refer to OBEDIENCE TO THE LAW in the sense of what the law justifies as "good" works as opposed to what the Law will not justify "good" works then you simply invalidate the whole phrase into nothingness.
On the other hand, if you demand that the phrase "justification by the deeds of the law" is restricted to ethnic Jews alone then you have defined the those terms to by snyonomous with JEWISH ETHNICITY rather you like it or not or admit it or not.
Finally, the fact that the very same words are used just seven verses earlier in Romans 3:19-20 in the exact same context of justification proves your interpretation is wrong.
1. Romans 3:19-20 is the conclusion of the evidence provided in Romans 3:10-18 as proof one cannot be justified by the law as Romans 3:10-19 defines "deeds" that the law cannot justify but rather defines as sin.
2. Romans 3:10-18 INCLUDES GENTILES as Romans 3:10-18 simply further proves what Romans 3:9 concludes:
What then? are we better than they? No, in no wise: for we have before proved both Jews and Gentiles, that they are all under sin;
3. Romans 3:19-20 uses UNIVERSAL TERMS in keeping with "Jews and gentiles" in verse 9 which is further proven in 3:10-18 which in turn is concluded in verses 19-20 in UNIVERSAL TERMS:
a. "NO FLESH" not merely Jewish flesh
b. "ALL THE WORLD" not merely the Jewish world
c. "EVERY MOUTH" not merely the Jewish mouth
4. Romans 3:21-26 provides the true basis for justification for both Jews and Gentiles not merely Jews.
5. Therefore, Romans 3:27-28 is the conclusion in regard to both Jews and Gentiles (v. 9) as their works are both characterized in verses 10-18 and thus equally and universally condemned by the law in verses 19-20 with no other way to be justified by by faith in the provision of Christ (vv. 21-26) and that, and that alone is the ONLY BASIS why any man (Jew or Gentile) be justified by the deeds of the law or any law of works (v. 27) but only by faith (vv. 28-31).