What conclusion does Paul reach at the end of Romans 3 about the human race?

Paul concludes that whether they were immoral, moral, or religious Jew, they were all enemies of God. God, through Paul, built His case against the whole human race in Romans 1–3, showing that no group escaped that conclusion.

Les explains that in Romans 1, 2, and 3 God by the pen of the Apostle Paul built His case against the whole human race. He began with the immoral person, then moved to the good moral person, and then to the religious Jew, since the Jews were the only real religion of Paul's day. Coming into chapter 3, the conclusion is that whether they were immoral, moral, or religious Jew, they were all enemies of God.

Romans 3

How does Paul build his case against the human race in Romans 1-3?

Paul builds his case in Romans 1-3 by proving the entire human race utterly sinful and rebellious, opposite to the things of God. He addresses the gross immoral person, the moral person, and the religious person, then combines all three categories, declaring there is no difference because all have sinned and come short in glory.