What does Romans 3:9 mean?
Paul seems to repeat the question from the beginning of this chapter when he asked, "What is the advantage of being a Jew?" There he said there was much advantage in every way. After all, God had given to the Jews His own words in the law.Now, though, Paul responds to the question, "Are we Jews better off?" much differently. He says they are not. Paul points out once more that every person is "under sin," whether Jewish or Gentile. In other words, the Jewish people do have an advantage on a national level. They are God's chosen people and the receivers of great promises from Him. God remains faithful to His covenants with them. And, as members of God's chosen people, they have particularly close access to God's words and revelations.
However, on a personal level, there is no extra advantage to being Jewish when it comes to being judged by God for sin. Jewish or Gentile, God will hold every person accountable for their actions.
The following verses will show that by the standards of that judgment, every last human being ought to be deemed unrighteous before God for our sinfulness.