Romans 3:29-31 :

Or is God the God of Jews only? Isn’t he the God of Gentiles also? Yes, of Gentiles also, since indeed there is one God who will justify the circumcised by faith, and the uncircumcised through faith. Do we then nullify the law through faith? May it never be! No, we establish the law.

Jew and Gentile are no longer divided because they are both joined together by one Messiah. Just as Adam caused the sin problem of both Jews and Gentiles, Jesus fixed the problem for both and that included Adam too.

The law is well “established” when the purpose of the law is clearly followed and promoted. That is exactly what Christianity does. This does not mean that Christians are not supposed to promote good works, it’s just that our good works have nothing to do with the law. The problem we often have is in thinking that the law’s purpose is to bring people closer to God by encouraging them to do good works. The reality is that the law serves as a way to clearly demonstrate to everyone just how far off the mark they really are.

The law is actually a clear demonstration of the distance that man has traveled from God, and the distance that Jesus Christ had to cover to bring us back. The law is not the problem. We are. So, we establish the law by making its purpose clear so that we can reveal the Savior of mankind in His true light.