I'm currently studying Romans in Disciple class. Our teacher divides Romans into five parts: sin, salvation, sanctification, setting aside of Israel, and service.
The first part deals with sin.
Sin is any action of man that separates him from God. Sin came into the world through Adam. Paul makes it clear that all mankind is under judgement for sin. No one is exempted.
In chapter one, Paul identifies several areas where man's sin is condemned by God.
The first is man's ungodliness and unrighteousness. Since the creation of the world, God's eternal power and divine nature have been made clear to man by that which God has made. Therefore man is without an excuse. The result is that God has given them over to the desire of their hearts. Romans 1:26
Man's failure to acknowledge God results in God giving them over to a depraved mind. Romans 1:28
Man is also condemned for judging others.
"Therefore you are without excuse, whoever you are, when you judge someone else. For on whatever grounds you judge another, you condemn yourself, because you who judge practice the same things." Romans 2:1-2
This sin results in God's judgement. Romans 2:3
God also condemns the Jew who teaches his children the law, but does not carry it out himself. Romans 2:17-22
Paul goes on in quote the Scriptures to demonstrate that all of mankind is under judgement for sin. Romans 3:9-18
Paul rests his case that all are under judgement in Romans 3:20:
"For no one is declared righteous before him by the works of the law, for through the law comes the knowledge of sin." Romans 3:20
We acknowledge that we are all under judgement for the sin we have committed again You. We cry out for your mercy! We repent and accept your gift of redemption and salvation through Your Son's work on the cross. We pray in the name of Christ. Amen