Nothing "abolishes" the work of the Lord Jesus, that wording odd. In any case, a person not of a true faith is not in a state of grace, is not saved, one that seeks salvation by other than grace and faith in the work of the Lord Jesus. For the relationship of law versus faith, in terms of salvation, the futility of law to save, here is a good treatise in scripture, which speaks for itself:
Galatians 5
Christian Liberty
1 Stand fast therefore in the liberty by which Christ has made us free, and do not be entangled again with a yoke of bondage.
2 Indeed I, Paul, say to you that if you become circumcised, Christ will profit you nothing.
3 And I testify again to every man who becomes circumcised that he is a debtor to keep the whole law.
4 You have become estranged from Christ, you who attempt to be justified by law; you have fallen from grace.
5 For we through the Spirit eagerly wait for the hope of righteousness by faith.
6 For in Christ Jesus neither circumcision nor uncircumcision avails anything, but faith working through love.
Love Fulfills the Law
7 You ran well. Who hindered you from obeying the truth?
8 This persuasion does not come from Him who calls you.
9 A little leaven leavens the whole lump.
10 I have confidence in you, in the Lord, that you will have no other mind; but he who troubles you shall bear his judgment, whoever he is.
11 And I, brethren, if I still preach circumcision, why do I still suffer persecution? Then the offense of the cross has ceased.
12 I could wish that those who trouble you would even cut themselves off!
13 For you, brethren, have been called to liberty; only do not use liberty as an opportunity for the flesh, but through love serve one another.
14 For all the law is fulfilled in one word, even in this: "You shall love your neighbor as yourself."
15 But if you bite and devour one another, beware lest you be consumed by one another!
Morality, actually, never springs from keeping a checklist. Morality is the result of a righteous inner man. Otherwise criminals may keep law, so as not to be punished. It is walking in the light of Christ, being of the love of God, that is the Christian law, and all immorality springs from a breach in the love of God and fellow man. One with the Holy Spirit neither needs a checklist to know right from wrong, very conscience of man even having moral dictates. In terms of Christianity, the law most serves to prove we are all sinners and condemned, that we can only be saved by grace, have no righteousness our own to satisify holy and perfect God, a subject Paul also addresses, Hebrews going into how not even Israel of the Old Testament was saved by other than faith, none saved by works of the law. As a matter of fact, the Lord Jesus was the only man to ever fulfill the requirements of the law, who lived a perfect life, without the sin that only can condemn.
You therefore, if you think the law can save you, are wasting your time, entirely, as you must keep the whole law, and, as they say, lots of luck with that: you're already, no doubt, out of that competition.
James 2:10 For whoever shall keep the whole law, and yet stumble in one point, he is guilty of all.
The Lord Jesus even pointed out how lust is adultery, hatred murder, that sin which condemns includes merely evil thoughts. Without the blood of Christ, you could have an entire library of the law, which will only send you to hell, even serves to more readily do so, since you can't plead any ignorance, if you're a legalist. All the law can do, in this case, is show a sinner knew better!
Romans 5
20 Moreover the law entered that the offense might abound. But where sin abounded, grace abounded much more,
21 so that as sin reigned in death, even so grace might reign through righteousness to eternal life through Jesus Christ our Lord.