brother Blaine, then how do your interpret these verses from the NT,
"If you really fulfill the royal law according to the Scripture, "You shall love your neighbor as yourself," you do well; 9 but if you show partiality, you commit sin, and are convicted by the law as transgressors. 10 For whoever shall keep the whole law, and yet stumble in one point, he is guilty of all. 11 For He who said, "Do not commit adultery," also said, "Do not murder." Now if you do not commit adultery, but you do murder, you have become a transgressor of the law. 12 So speak and so do as those who will be judged by the law of liberty."-James 2:8-12
"What shall we say then? Is the law sin? Certainly not! On the contrary, I would not have known sin except through the law. For I would not have known covetousness unless the law had said, "You shall not covet." 8 But sin, taking opportunity by the commandment, produced in me all manner of evil desire. For apart from the law sin was dead. 9 I was alive once without the law, but when the commandment came, sin revived and I died. 10 And the commandment, which was to bring life, I found to bring death. 11 For sin, taking occasion by the commandment, deceived me, and by it killed me. 12 Therefore the law is holy, and the commandment holy and just and good. 13 Has then what is good become death to me? Certainly not! But sin, that it might appear sin, was producing death in me through what is good, so that sin through the commandment might become exceedingly sinful. 14 For we know that the law is spiritual, but I am carnal, sold under sin. 15 For what I am doing, I do not understand. For what I will to do, that I do not practice; but what I hate, that I do. 16 If, then, I do what I will not to do, I agree with the law that it is good. 17 But now, it is no longer I who do it, but sin that dwells in me. 18 For I know that in me (that is, in my flesh) nothing good dwells; for to will is present with me, but how to perform what is good I do not find. 19 For the good that I will to do, I do not do; but the evil I will not to do, that I practice. 20 Now if I do what I will not to do, it is no longer I who do it, but sin that dwells in me. 21 I find then a law, that evil is present with me, the one who wills to do good. 22 For I delight in the law of God according to the inward man. 23 But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members. 24 O wretched man that I am! Who will deliver me from this body of death? 25 I thank God--through Jesus Christ our Lord! So then, with the mind I myself serve the law of God, but with the flesh the law of sin."-Romans 7:7-25
Those and other passages clearly teach that the moral law as revealed at Mt Sinai is certainly binding today even for Christians. But we are no longer under the ultimate judgment and curse of that law as those are who are outside of Christ. And we are now able to fulfill the moral law by the power of the indwelling Spirit. But there is no true dichotomy between NT moral law and OT moral law.
Regarding the Sabbath(which you point out from Col.2), it was ultimately fulfilled in Christ as our ultimate rest from our own works. But there is also another principle behind it that is also applicable to us today, namely, the need for us to rest at least one day in the week. That is how God designed our bodies to work.
But God's moral law is not only seen in the Ten Commandments but also in other parts of scripture. The Ten Commandments are the principle list of God's moral law revealed in the OT.