The bible is to be our guide if we call ourselves a Christian; one who follows Christ. It is important to note that the Scriptures clearly state that the Law was given to Israel and not to the Gentiles or the Church ~Deut. 4:7-8; Ps. 147:19-20; Mal.4:4). The Laws of Moses were to show man what sin is.Gal. 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.
At no time is it taught in Scripture that the Mosaic Law was the means of salvation. No man except God in the Flesh,-Jesus. Ever kept the law perfectly nor can or even BE justified by it. The law is holy and good but has it's place, to show man what sin is. MAN has tried to divide it into three parts, moral, ceremonial, sacrificial but what does the bible actually say?
Duet. 27 says;
Cursed be he that confirmeth not all the words of this law to DO them. And all the people shall say, Amen.
The law requires obedience, and that perfect and constant, and in failure thereof curses, in proof of which the apostle produces this passage;
Galatians 3:10 Apostle Paul wrote;
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.(we see here it says ALL not part)
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.
What did James say? James ch. 2:10
For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
2 Cor. ch. 3 explains it all.
What is the ministration of death written ON STONE ?..that was done away with? But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away:
8 How shall not the ministration of the spirit be rather glorious?
9 For if the ministration of condemnation be glory, much more doth the ministration of righteousness exceed in glory.
10 For even that which was made glorious had no glory in this respect, by reason of the glory that excelleth.
11 For if that which is done away was glorious, much more that which remaineth is glorious.
12 Seeing then that we have such hope, we use great plainness of speech:
13 And not as Moses, which put a vail over his face, that the children of Israel could not stedfastly look to the end of that which is abolished:
14 But their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ.
15 But even unto this day, when Moses is read, the vail is upon their heart.
16 Nevertheless when it shall turn to the Lord, the vail shall be taken away.
17 Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.
18 But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord.
Now, we are under the laws of Christ, and a New Covenant. Some have tried to say," God does not change" and use Malachi 3:6. But keep this in context. This speaks of his character as all the other scriptures do when it is written he changes not or does not change.
God said he would make a New covenant "not like the one he made before".
Jer. 31; 31,
Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:
32 NOT ACCORDING to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I WAS an husband unto them, saith the LORD:
33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
Hopes this helps. Let the scriptures be our authority.