Dunn’s work meant that what Paul is objecting to is the insistence that it’s necessary to become Jewish in order to be righteous before God. When he writes these key texts, what he is objecting to is the attempt to impose Jewish law observance and the Jewish way of life on his Gentile converts. Paul is saying that these key markers of Jewish identity and key markers of the boundary between them and the Gentiles mustn’t be imposed on Gentile followers of Jesus as a precondition for those Gentiles