But on the contrary, when they saw that the gospel for the uncircumcised had been committed to me, as the gospel for the circumcised was to Peter(for He who worked effectively in Peter for the apostleship to the circumcised also worked effectively in me toward the Gentiles),and when James, Cephas, and John, who seemed to be pillars, perceived the grace that had been given to me, they gave me and Barnabas the right hand of fellowship, that we should go to the Gentiles and they to the circumcised. - Galatians 2:7-9
http://www.biblegateway.com/passage/?search=Galatians2:7-9&version=NKJV
For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes, for the Jew first and also for the Greek.For in it the righteousness of God is revealed from faith to faith; as it is written, “The just shall live by faith.” - Romans 1:16-17
http://www.biblegateway.com/passage/?search=Romans1:16-17&version=NKJV
Where is boasting then? It is excluded. By what law? Of works? No, but by the law of faith.Therefore we conclude that a man is justified by faith apart from the deeds of the law.Or is He the God of the Jews only? Is He not also the God of the Gentiles? Yes, of the Gentiles also,since there is one God who will justify the circumcised by faith and the uncircumcised through faith.Do we then make void the law through faith? Certainly not! On the contrary, we establish the law. - Romans 3:27-31
http://www.biblegateway.com/passage/?search=Romans3:27-31&version=NKJV
Get thee hence, Satan. I am not a proselyte, that I have become a Jew through circumcision. I was a Gentile, become a believer in Christ through Christ.