I've lost count of the number of times vekky & I have answered this one, so by way of (a very brief) reply, let me put a few questions to you instead of going over old ground again.
According to the NT, who are the true circumcision; the seed/children/heirs of the promise; the sons/ seed/offspring of Abraham; the children of the free woman - ie Sarah; the tabernacle of David; the temple of God; the real (heavenly) Jerusalem; a chosen race; a royal priesthood and a holy nation? What is a real/true Jew and who/what is the Israel of God in Gal. 6:16? And by way of contrast, what was said to (and about) those who relied on their physical ancestry as a guarantee of their standing before God?
Now go, seek out all these phrases (and quite possibly a few more besides that I've left out) in your Bible, and tell us what you find. You will then have answered your own question, and done so without the aid of 'the writings of men'.
Well, sometimes we do inhabit our own echo chambers, but that doesn't alter the facts too much.
If you want me to try even harder, I'll be happy to oblige. Just not right now. I have other urgent matters to attend to presently. That's why I had to be brief, and yes,..... blunt.
25 Circumcision indeed is of value if you obey the law; but if you break the law, your circumcision has become uncircumcision. 26 So, if those who are uncircumcised keep the requirements of the law, will not their uncircumcision be regarded as circumcision? 27 Then those who are physically uncircumcised but keep the law will condemn you that have the written code and circumcision but break the law. 28 For a person is not a Jew who is one outwardly, nor is true circumcision something external and physical. 29 Rather, a person is a Jew who is one inwardly, and real circumcision is a matter of the heart—it is spiritual and not literal. Such a person receives praise not from others but from God.
Romans 2:25-29
Trapper has already decided the answer to that one. It only remains for you to draw your own conclusions from the example passage above. There are many more to similar effect, but seriously, you should do your own research 'to see if these things are so'.