Distinctions that are often made in the current context and not applicable to the context of the passage of when it was writen. Yes its true.
Such as a particular Dr. Suggesting that in Romans Paul wasn't making a comparison between mosaic law and faith but was rather arguing doing anything in any way in any context and faith.
I am having a hard time following your logic because of the way you express yourself above.
The current context in Romans 3:19-5:2 denies completely that Paul had only in view Judaic law or the idea that one must become a Jew to be justified. It certainly includes it, and all other Law keeping concepts as Romans 3:27 reduces justification down to two basic Laws:
1. The law of works
2. The law of faith
In nearly every description of "the law of works" the emphasis is never upon becoming a "Jew" but upon "deeds" and "works" in contrast to "grace" and "faith".
In nearly every contast given in this context, faith or believing is NEVER once contrasting to being a "Jew" but in contrast to "works" or "deeds."
For example, in Romans 4:1-5, the gentile born Abraham existed previous to any Judaic law. However, verse 2 demonstrate Abraham did have "works" he could boast in but just not before God and they are the "works" in question in regard to verse 4 and the general law that "works" operate under. However, being a "jew" versus "Gentile" could have nothing to do with these works of Abraham and has nothing to do with the general law of works in Romans 4:4:
Rom. 4:4 Now to him that worketh is the reward not reckoned of grace, but of debt
Try replacing the word "worketh" with "Jew" and see if it makes any sense in regard to a fundemental law that characterizes all works? What does being a "Jew" have to do with "debt"?
However, the GENERAL LAW of works (Rom. 3:27) in regard to justification is spelled out in Rom. 2:6 "according to his deeds" has eveything to do with this principle of works in Romans 4:4.
The man who is attempting to justify himself before God by his "deeds" is trying to place God in his "debt" as a worker would place his employer in his debt by putting in so many hours. He is requiring "pay" for his work.
Not only is this contrast between the "law of works" and "the law of faith" the only two alternatives given by Paul for justification, but he eliminates "the law of works" as a valid law to be justified before God.
This same TWO contrasting ways have been present since the Garden with "the way of Cain" versus "the way of the Lord" or "the broad way" versus the "narrow way" or the house built upon "sand" verus the house built upon "the rock" or salvation "by grace" versus "by works."
The "law of works" certainly includes the idea of becoming a Jew in order to be justified before God but that whole concept is based upon the idea that the Jew has the law of God and obedience by the Jew separates him from the Gentile and so the root or foundational problem is justification by "deeds".