Romans 3 is talking about "
Initial Salvation" and or how we are not saved by the works of the Law. Romans 3:1 says what profit is there in circumcision? What advantage does the Jew have? Romans 4:9-12 makes a case how we are not initially saved by circumcision involving Abraham. But did circumcision save in the Old Testament? Yes, after one is first saved by faith in the Lord, a person needed to then later continue in the faith and be circumcised in the OT Covenant (When it used to be in effect before the cross). For...
The Old Covenant says this about circumcision:
"And the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be cut off from his people; he hath broken my covenant." (Genesis 17:14).
Yet, the New Covenant says this about circumcision:
"Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing." (Galatians 5:2).
In other words, Paul is fighting against "Circumcision Salvationism" (Which was a heresy condemned also at the Jerusalem counsel - See Acts of the Apostles 15:1, Acts of the Apostles 15:5, Acts of the Apostles 15:24). So he is saying that folks need to first repent (seek forgiveness) and believe in Jesus for salvation first as the foundation of their faith to be saved. This is why Paul says all have sinned and come short of the glory of God. Paul is talking about how everyone has sinned at one point in their lives. For even the believer sinned as part of their old life (See Ephesians 2:2-3). You no doubt believe Romans 3:10 and Romans 3:23 is even referring to the present current state of the believer in how they live now. Meaning, you believe that Paul is saying that believers even sin in the present tense all the time. But this is not what Paul is saying. How do we know? Well, if you believe Paul is referring to the present tense life of how a believer lives in regards to Romans 3:10, and Romans 3:23, then you must also believe a believer does not seek after God and they have no understanding according to Romans 3:11, too. Are you saying you have no understanding and you do not seek after God? I sure hope not. So then you cannot make Romans 3:10 and Romans 3:23 apply to your present life in how you live, either. In relation to the believer: These verses are talking about our old life before we came to Christ (See again: Ephesians 2:2-3).