Rom 2:25-29

25 Being circumcised is worthwhile, if you obey the Law. But if you don't obey the Law, you are no better off than people who are not circumcised. 26 In fact, if they obey the Law, they are as good as anyone who is circumcised. 27 So everyone who obeys the Law, but has never been circumcised, will condemn you. Even though you are circumcised and have the Law, you still don't obey its teachings. 28 Just because you live like a Jew and are circumcised doesn't make you a real Jew. 29 To be a real Jew you must obey the Law. True circumcision is something that happens deep in your heart, not something done to your body. And besides, you should want praise from God and not from humans.