I suggest that Romans 4 actually affirms the position for which I am advocating.So, simply defining the EXTERNAL law written upon stone to be what Paul denies can justify anyone is making a distinction that Paul refuses to make as he also denies the obedience, performance, works, deeds, doing of that law through the life of Abraham as inclusive of justification.
Romans 4 is a methodically repudiation of your entire interpretation.
Romans 4 does not subvert ultimate justification by good works. Here is the first bit of Romans 4:
What then shall we say that Abraham, our forefather, discovered in this matter? 2If, in fact, Abraham was justified by works, he had something to boast about—but not before God. 3What does the Scripture say? "Abraham believed God, and it was credited to him as righteousness."
Romans 4:2 is clearly a reference to the Law of Moses and doing its works. True, the Law of Moses was not around in Abraham's time. But that is beside the point as I will demonstrate in a follow-on post. I have been arguing that Paul denies justification by doing the works of the Law of Moses and not justification by good works. Those who argue otherwise have severe problems with Romans 2:6-7.
Paul's argument is basically directed at the Jew, telling him that salvation is not limited to Jews and Jews only:
For we maintain that a man is justified by faith apart from observing the law. 29Is God the God of Jews only? Is he not the God of Gentiles too? Yes, of Gentiles too
Note that Paul has written these words just a couple of sentences back from Romans 4:2.
The problem with seeing Romans 4:2 as anything other than a reference to the Law of Moses makes Paul into a scattered incoherent thinker. In Romans 3, he has just told us how justification is not based on doing the Law of Moses. Then throughout the first 17 or so verse of chapter 4, Paul is still making the same argument – salvation is not limited to Jews.
The argument is about how Abraham was not justified in virtue of being Jewish and, by extension therefore, justification is not for Jews only:
Is this blessedness only for the circumcised, or also for the uncircumcised? We have been saying that Abraham's faith was credited to him as righteousness. 10Under what circumstances was it credited? Was it after he was circumcised, or before? It was not after, but before!
The case makes itself – Paul is bending over backwards to make it clear that his topic here is the availability of justification to both Jew and Gentile alike. And this is precisely why it makes sense to assert, in 4:2, that the Jew (of whom Abraham is genetic father) is not justified by the works of the Law of Moses. Yes, the law of Moses was not around in Abraham’s time. But Paul is really making a broader argument about justification not being limited to the Jew.
And what is the ethnic delimiter of the Jew? The law of Moses, of course.
In the next post, I will shore up the case that the fact that the fact that the Law of Moses was not around in Abraham's time is actually beside the point.