No, a man is a Jew because he is one inwardly, and circumcision is a matter of the heart, by the Spirit, not by the written code. Such a man’s praise does not come from men, but from God.
29. What he then adds, in the spirit, not in the letter, understand thus: He calls the outward rite, without piety, the letter, and the spiritual design of this rite, the spirit; for the whole importance of signs and rites depends on what is designed; when the end in view is not regarded, the letter alone remains, which in itself is useless.
In the latter part of the chapter the apostle directs his discourse more closely to the Jews, and shows what sins they were guilty of, notwithstanding their profession and vain pretensions. He had said (Rom 2:13) that not the hearers but the doers of the law are justified; and he here applies that great truth to the Jews. Observe, I.
Commenting on Romans 2:17-29
Verse 29. But he is a Jew. He comes up to the design of the Jewish institution; he manifests truly what it is to be a Jew. Which is one inwardly. Who is in heart a Jew. Who has the true spirit, and fulfills the design of their being separated as a peculiar people.