romans 3

But if our unrighteousness serves to show the righteousness of God, what shall we say? That God is unrighteous to inflict wrath on us? (I speak in a human way.) Romans 3:5
both jews and gentiles are held accountable (Romans 3:19) and must be judged by God for their wrongdoings. if God was to be considered unrighteous for punishing the lost, then no evil in the world would be punished. and God in His holiness and perfection cannot accept anything impure or sinful.
For by the works of the law no human being will be justified in his sight, since through the law comes knowledge of sin. Romans 3:20
every human being has sin and the law acts like a death note, as in it makes us aware of our sin, because every human breaks the law and is guilty. this is paul's conclusion: no one can have a right standing with God by his own works, but rather one who is justified trusts in what the Lord has done on the cross- the righteous shall live by faith (Romans 1:17; 3:25, 28).