You couldn't be more wrong.
i think you have made a mistake.
Paul clearly teaches the continued role of the law in condemning the lost world in Gal 3 - and in Gal 3 it is not the law that is cursed but the sinner - so that Christ becomes "a curse for us". The perfect Law of God curses the sin.
"
1 O
foolish Galatians, who hath
bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?
2 This only would I learn of you,
Received ye the Spirit by the
works of the law, or by the
hearing of faith?
3 Are ye so foolish? having
begun in the Spirit, are ye now made perfect by the flesh? 4 Have ye suffered so many things in vain? if it be yet in vain.
5 He therefore that ministereth to you the Spirit, and worketh miracles among you, doeth he it by the works of the law, or by the
hearing of faith?6 Even as Abraham
believed God, and it was accounted to him for righteousness.
7 Know ye therefore that they which are
of faith, the same are the children of Abraham.
8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.
9 So then they which be
of faith are blessed with faithful Abraham.
10 For as many as are of the
works of the law are under the curse: for it is written, Cursed is every one that
continueth not in all things which are written in the book of the law to do them.
11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live
by faith.
12 And the law is not of faith: but, The
man that doeth them shall live in them. 13 Christ hath redeemed us from the
curse of the law, being
made a curse for us: for it is written, Cursed is every one that hangeth on a tree:
14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the
promise of the Spirit through faith. "
Purpose of the Law
19 What purpose then
does the law
serve? It was
added because of transgressions, till the Seed should come to whom the promise was made;
and it was appointed through angels by the hand of a mediator. 20 Now a mediator does not
mediate for one
only, but God is one.
21
Is the law then against the promises of God? Certainly not! For if there had been a law given which could have given life, truly righteousness would have been by the law. 22 But the Scripture has confined all under sin, that the promise by faith in Jesus Christ might be given to those who believe. 23 But
before faith came, we were kept under guard by the law, kept for the faith which would afterward be revealed. 24 Therefore the law was our tutor
to bring us to Christ, that we might be justified by faith. 25 But
after faith has come, we are no longer under a tutor.
Notice that Paul argues that they received the Spirit by the hearing of faith - when they are saved - when they accept the Gospel. And then the law no longer condemns them.
Thus the LAW of Gal 3 continues even after the cross - for it is not at all against/opposed-to the promises of God!
We see the SAME continued moral law of God in Rom 3
Rom 3
19 Now we know that whatever the law says, it says
to those who are under the law, that every mouth may be stopped, and all the world may become guilty before God. 20 Therefore by the deeds of the law no flesh will be justified in His sight, for
by the law is the knowledge of sin.
the LAW of God continues to this day to define what sin is.