In Christ you had a different kind of circumcision, one that was not done by human hands. That is, you were made free from the power of your sinful self. That is the kind of circumcision Christ does.
But we are the ones who have the true circumcision—we who worship God through his Spirit. We don’t trust in ourselves or anything we can do. We take pride only in Christ Jesus.
You were not born as Jews. You are the people the Jews call “uncircumcised.” Those Jews who call you “uncircumcised” call themselves “circumcised.” (Their circumcision is only something they themselves do to their bodies.)
You have the written law and circumcision, but you break the law. So those who are not circumcised in their bodies, but still obey the law, will show that you are guilty.