Read: Romans 3:27-31
Where, then, is boasting? It is excluded. Because of what law? The law that requires works? No, because of the law that requires faith. For we maintain that a person is justified by faith apart from the works of the law. Or is God the God of Jews only? Is he not the God of Gentiles too? Yes, of Gentiles too, since there is only one God, who will justify the circumcised by faith and the uncircumcised through that same faith. Romans 3:27-30
Paul raises and answers three simple questions to show us the natural results of this tremendous acceptance that God gives us in Jesus Christ. First, Who can boast? No one, absolutely no one. How can you boast when everyone receives the gift of grace without any merit on his part? This means that any ground for self-righteousness is done away with, and this is why the ugliest sin among Christians is self-righteousness. When we begin to look down on people who are involved in homosexuality, or greed, or gambling, or whatever — when we begin to think that we are better than they are — then we have denied what God has done for us. All boasting must be excluded. There are no grounds for anybody to say, Well, at least I’ve never done that. The only ground of acceptance is the gift of grace.
Next is Paul’s second question: Is anyone excluded from grace, Jew or Gentile? The answer is NO!, God has no most-favored-nation; they are all alike before him. Paul argues, Is God the God of Jews only? Then there must be two Gods — one for the Jews and one for the Gentiles. But that cannot be; there is only one God; God is one. Therefore he is equally the God of the Gentiles and the God of the Jews, because both must come on exactly the same ground. This is the wonderful thing about the gospel. All mankind is leveled; no one can stand on any other basis than the work of Jesus Christ.