Romans 2:28-29

28Not everyone who seems to be a Jew is really a Jew who belongs to God. God does not accept a man just because someone has circumcised that man's body.

29No! A true Jew is someone who belongs to God in his spirit. He belongs to God because God's Spirit has changed his life. It is like God has circumcised him in his spirit, not in his body. The rules in God's Law cannot do that work in a person. Other people may not praise a person like that, but God will praise him.