"For where there is no law there is no sin" Romans 4:15. They cannot sin because they are not under the law or subject to it.
Romans 4 only speaks of being heirs, and how they which are of the law ( Judaism) are in wrath, because they are transgressing the law of God. ( remember by breaking/transgressing Gods law they are blaspheming God.)
Romans 2:23 Thou that makest thy boast of the law, through breaking the law dishonourest thou God?
Romans 4:14 For if they which are of the law be heirs, faith is made void, and the promise made of none effect:
15 Because the law worketh wrath: for where no law is, there is no transgression.
That was Romans 2, then Romans 4, now look at Romans 6.
Our bodies are to be yielded as those who are alive form the dead. ( believing being risen with Christ) as instruments of righteousness unto God. Then sin has no dominion over us, because we are not under the law ( of transgressing/breaking Gods law, then sin, then death, but we are under grace)
Shall we commit sin ? God forbid, we are the servants of who we yield ourselves to obey, of the same disobedience ( of Judaism in breaking the law of God) or of obedience unto righteousness ( under the law to Christ through grace)
Now they obey from the heart ( the law written in the heart through the Spirit. Hebrews 8:10/ 10:16.) the form of doctrine ( the Gospel of Christ) which was delivered to us, as Christ set us free to be servants of righteousness ( set free from transgression to be keepers of the law of Christ from the heart.)
Romans 6:13 Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God.
14 For sin shall not have dominion over you: for ye are not under the law, but under grace.
15 What then? shall we sin, because we are not under the law, but under grace? God forbid.
16 Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?
17 But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.
18 Being then made free from sin, ye became the servants of righteousness.
All those who are carnally minded, ( Judaism in the law) had and have death, (they were under carnal ordinances and after the law of a carnal commandment. Hebrews 7:16/ 9:10. )
They were never subject to the law of God, because that carnal mind is not spiritual, and is then enmity against God.) they are and were, in the flesh, and did not please God, they did what He hates. )
If we are in the Spirit, ( to now please God unlike Israel transgressing against God. 2 Timothy 2:4.) our body is dead because of sin ( which Judaism does in the law they break) and the Spirit is life because of righteousness ( we now do and serve.) What law is abolished was what was contained in ordinances.
Romans 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
8 So then they that are in the flesh cannot please God.
9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.
10 And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.
Ephesians 2:15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
Hebrews 7:16 Who is made, not after the law of a carnal commandment, but after the power of an endless life.
Hebrews 9:10 Which stood only in meats and drinks, and divers washings, and carnal ordinances, imposed on them until the time of reformation.
Now we are not without law ( that is silly) we are under the law to Christ. ( written in the heart now)
1 Corinthians 9:21 To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law.
The law was added because of the transgressions of all people.
When faith came, we are no longer under that law ( of ordinances and made under a carnal law) now we are no longer under a school master ( the law) as all are children of God by faith in Jesus Christ, and as many of us as have been baptized into Christ have put on Christ. ( charity the bond of perfectness and bowels of mercies.)
Galatians 3:19 Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.
Galatians 3:23 But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed.
24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.
25 But after that faith is come, we are no longer under a schoolmaster.
26 For ye are all the children of God by faith in Christ Jesus.
27 For as many of you as have been baptized into Christ have put on Christ.
Colossians 3:12 Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;
Colossians 3:14 And above all these things put on charity, which is the bond of perfectness.
All that have faith in Christ and his Gospel are spiritually "In Christ". God sees them only "In Christ". As far as God is concerned, they have fulfilled the law and all of their sins have been atoned for. They are spiritually in Christ and Christ is in heaven. God sees ALL THINGS in Jesus Christ.
Christ did all the Father said, always doing what pleases Him, as we do the same..
John 8:29 And he that sent me is with me: the Father hath not left me alone; for I do always those things that please him.
Romans 15:1 We then that are strong ought to bear the infirmities of the weak, and not to please ourselves.
2 Let every one of us please his neighbour for his good to edification.
3 For even Christ pleased not himself; but, as it is written, The reproaches of them that reproached thee fell on me.
1 Corinthians 10:32 Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God:
33 Even as I please all men in all things, not seeking mine own profit, but the profit of many, that they may be saved.
1 Thessalonians 4:1 Furthermore then we beseech you, brethren, and exhort you by the Lord Jesus, that as ye have received of us how ye ought to walk and to please God, so ye would abound more and more.
2 For ye know what commandments we gave you by the Lord Jesus.
3 For this is the will of God, even your sanctification, that ye should abstain from fornication:
Hebrews 11:6 But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
A word about James. James was a Judaizer. A Judaizer believes in Jesus, but also believes that you must keep the law of Moses. James thought that Gentle believers should be circumcised, Acts 15:1-21. Peter and Barnabus saw it differently. The book of James was directed to law keeping Jews, James 1:1.
What James shares about Abraham is accurate, Abraham did obey God, to make faith perfect.
If you disagree with that, please say so