Paul is rather paradoxically in many ways a stridently secular thinker

[Paul had good reason to confront a law conception of ethics inasmuch as it was a pressing political issue within the early Church. The evangelising that Paul dedicated his attention to was faced with a pressing practical problem, one that required Paul to devise a theoretical, but no less concrete, solution. (Here we can see why Paul’s reputation amongst Marxists as the Lenin of Christianity is well deserved!) The problem concerned the issue of whether new initiates into the Church should be required to hold to the Abrahamic law; a matter that crystallised over whether they ought to be circumcised or not. Paul was torn between placating Jewish Christians who were predominantly in favour of a hardline adherence to the Jewish law and the Gentile Christians who were not eager to adopt a strange new set of legalistic injunctions.
It can be tempting to read this debate as one with a narrow relevance, of a dispute over the merely particularised traditional law of the Jews and so of little relevance to our concerns, those of the moral law in general. However, this would be a mistake. This is because Paul stresses throughout his letters that what is at stake in this conflict is Christian identity as such, that in Christ there is neither Jew nor Gentile. Condensed in this opposition is not the particular ethnicised law of the Jews against its rejection; rather, it is the opposition between particular law and the universal ‘cosmic’ law. In rejecting the disjunction of Jew or Gentile, in saying neither/nor, Paul thus rejects law in general. Or rather, he asserts the priority of love over law, which it is tempting to read as akin to an assertion of the priority of the good over the right. Paralleling this subsumption of law under love is one that similarly subsumes duty under grace (kharis): one is not redeemed by works, one cannot ‘earn one’s due’ that way. So, rather than the divine acting as a source of legislation as in Anscombe, Paul thus marginalises any legalistic obligatoriness more forcefully than she does. Although all this is articulated in a religious mode, Paul is rather paradoxically in many ways a stridently secular thinker; at least, he has been easily appropriated by some materialists in this spirit. For obvious reasons though, he is not a central figure in moral philosophy, despite his relevance to issues such as the law conception of ethics and although much of his thought is deep and tacitly argumentative enough to merit it.
Ethics and the Moral Law, Part I: Anscombe
from Grundlegung by Tom]

What is at stake in this conflict is Savitri Eran identity. [TNM]