Isn't it true that the reason there is no condemnation for those in Christ is because they are not sinning?
1 John 3
5You know that he appeared in order to take away sins, and in him there is no sin.
In Romans 8:1, Paul had just described the plight of a Jew under the Law--ie, being mastered by sin, and condemned for it. When Paul says, "Therefore," what he is saying next is building upon what came before. "There is therefore now no condemnation for those in Christ".
Why not? "In Him there is no sin."
However, when the Christian sins (by doing what he doubts--walking in unbelief, not faith), he is condemned (Ro 14:23)--he compromises his justification. How can that be if "there is... no condemnation for those in Christ"?
Because this is an example of not remaining in Christ.
1 John 2
28And now, little children, abide in him, so that when he appears we may have confidence and not shrink from him in shame at his coming.
Hebrews 10
38But My righteous one will live by faith; and If [My righteous one] shrinks back, My soul has no pleasure in him.
Philippians 3
9and may be found in Him, not having a righteousness of my own derived from the Law, but that which is through faith in Christ, the righteousness which comes from God on the basis of faith, 10that I may know Him and the power of His resurrection and the fellowship of His sufferings, being conformed to His death; 11in order that I may attain to the resurrection from the dead.
12Not that I have already obtained it or have already become perfect, but I press on so that I may lay hold of that for which also I was laid hold of by Christ Jesus. 13Brethren, I do not regard myself as having laid hold of it yet; but one thing I do: forgetting what lies behind and reaching forward to what lies ahead, 14I press on toward the goal for the prize of the upward call of God in Christ Jesus.
Whereas the one who remains in Christ enjoys "no condemnation", the one who does not remain in Christ is "condemned".
How to remain in Christ?
1 John 3
23And this is his commandment, that we believe in the name of his Son Jesus Christ and love one another, just as he has commanded us.
24Whoever keeps his commandments abides in God, and God in him. And by this we know that he abides in us, by the Spirit whom he has given us.
Therefore, when Romans 14:23 refers to the Christian who is condemned for breaking faith by doing what he does not believe, it is teaching that this person is not abiding in Christ. Obviously, to abide in Christ means to believe in His mercy that reconnects you to Him, and to then walk before Him in peace.
Romans 1:17 says "God's righteousness is revealed from faith to faith", thus the Christian, who is to reveal God's righteousness (not his own), is, in all his actions, to be "fully convinced in his own mind" (Romans 14:5)--and, because this is true, if the Christian does what he doubts is correct before the Lord, it is sin (not the revelation of God's righteousness) whereby the Christian is condemned (Romans 14:23).
How did the Christian, the justified, become condemned?
By not abiding in Christ.
How?
By not keeping God's commands (1 Jn 3:23,24).
There is no other accounting for this anomaly--"there is no condemnation for those in Christ", yet "the Christian who sins is condemned"--and, certainly, the OSAS crowd cannot account for it.
The New Testament epistles have words like "remission of sins" and "sins may be blotted out" and "the forgiveness of sins" and "wash away thy sins" and "whose sins are covered" and "impute sin" and "are dead to sin" and "condemned sin in the flesh" and "take away their sins" and "Christ died for our sins" and "purged our sins..." The book of Romans begins talking about Jews and Gentiles being both under sin and this should not be anything new to us since both are still broken without the spirit of God. And yet for some mysterious reason I live on a planet where many Christians think their flesh is justified by the deeds of the law even after the book of Romans tells us plainly that everyone except the Christian is under sin (Romans 3:20 says Jews and Gentiles).
Romans tell us "sin is not imputed when there is no law" and "that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin." And then there's verse 7 with "For he that is dead is freed from sin." I never understood Romans 6 because I was taught that I was a sinner saved by grace. Let's look at what Romans is saying: Christ died unto sin once and now he lives unto God. How are we who are still alive going to be able to likewise reckon ourselves to be dead indeed unto sin, but alive unto God? It seems to me it must be done through Jesus Christ our Lord. It's not about us or our broken selves. It's him we must function in. Here's the verse "Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord."
It appears both Catholic and Protestant churches do not teach that "sin shall not have dominion over you: for ye are not under the law, but under grace." Nor do they teach "For when ye were the servants of sin, ye were free from righteousness." And so "Being then made free from sin, ye became the servants of righteousness." I'm going to skip over Romans 7 because it tells us right up at the top of the chapter that Paul is talking to those who are into or know the law. And then the context of the whole chapter is how we can see it's all about Israel and their Law and how they toy with their flesh.
What Paul talks about in the seventh chapter of Romans is what occurs to the believer who still thinks the Law applies to them. They end up spiritually dying by the commandment and realize that the commandment does not produce life. The war is with their flesh because they are still believing the Law has power over them. In the eighth chapter of Romans is where it explains how we overcome this whole issue by living in the spirit and being dead to the Law. We cannot live by faith in what Christ has done for us and still think our obedience to written laws are necessary. To do so takes away from the perfect work of Christ and places salvation and righteousness back in our own hands. Romans 8 states "the Spirit of life in Christ Jesus hath made me free from the law of sin..."
The verse in 2 Corinthians 5:21, is talking about the "righteousness of God in him." It's the "in him" that nobody seems to be able to understand. This whole thing functions "in him." It's in Christ and therefore in the new nature that is mentioned just a few verses above this in verse 17 where it says "new creature:" It's not that we do not sin in our old man nature. It's that we do not sin in the new man that we are told to put on. The churches have destroyed this idea by teaching we put on the new man by following the teachings of Jesus as we walk in our flesh. So this is a lost art.
In the book of Colossians, we read "putting off the body of the sins of the flesh by the circumcision of Christ:" We did not put it off. It was the circumcision of Christ. Two verses later we read "together with him, having forgiven you all trespasses;..." Again, it's "in him" or "with him." I also want to get the book of Hebrews in here where we see Christ offered himself once "for this he did once" and not like the high priest who offered up the sacrifice daily. The Lord Christ "after he had offered one sacrifice for sins for ever, sat down on the right hand of God;..."
Peter has the same mindset as Paul when he writes in 1 Peter "that we, being dead to sins,..." Peter goes on to say that Christ suffered once for sins so as to bring us to God, and so this is why the Scripture reads "being put to death in the flesh, but quickened by the Spirit:" Again, the old man crucified and the new man put in its place. Peter again, "ceased from sin;..." Put that mindset on or as Peter writes "arm yourself likewise with the same mind:" Because he that has suffered in the flesh or was crucified in the flesh has put on the new man because the other one is dead. That new person "hath ceased from sin;..."
The last verse I'm going to mention has "in him" again. From 1 John we read "that he was manifested to take away our sins; and in him is no sin." We cannot sin in him because there's no sin in him and this is why "Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God."