Or maybe you are still under the curse (Galatians 3:10-14) and that's why you reject Christ and keep the old law (who is more than the ten commandments, btw).
Oh the terrible curse of the Law...
Rom 7:12 Wherefore the law is holy, and the commandment holy, and just, and good.
Gal 3:13 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:
What is the curse of the Law?
Rom 8:1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Rom 8:2 For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
Rom 8:3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:
Rom 8:4 That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
Rom 8:5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
Rom 8:6 For to be carnally minded is death; but to be spiritually minded is life and peace.
Our inability to obey God and keep the Law WITHOUT the help of the Holy Spirit which was made available on Pentecost, 31AD.
(Interestingly enough, it was given on a Feast of the Lord from Lev 23, not on xmas or Ishtar or some other pagan holiday.)
Gal 3:13 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:
Christ died to pay the penalty for our sins (the curse that meant eternal death) not to do away with the Law...
Rom 3:31 Do we then make void the law through faith? God forbid: yea, we establish the law.
Again, pulling one verse out of context without reading all of Paul's writings brings a complete misunderstanding.