Amazingly some of our fellows believe they can defend the doctrine of Biblical marriage while at the same time being free from the Law of Moses. This is done on some kind of evolutionary basis as applied to the character of YHVH. However, to have some other source than Torah for our ideas of right and wrong is to have a some other God than YHVH. Also, to be partial in the law is to undercut your own authority and destroy your power to be productive.
Please understand, the Law of Moses and the Law of Christ are the same. Christ said that if they believed in Moses they would also believe in Me since he spoke of Me. More importantly, once this evolutionary thinking is brought into the discussion on the what the Scriptures teach about marriage then any thought of the ongoing validity of plural marriage is made moot since the definition of marriage would also be subject to change and “improvement.”
Being free in Christ means being free from sin, not free from law. Christ saved us from the condemnation of the law so we could be reconciled to it, not to be free from it. The proper relationship between Moses and Christ is spelled out by Christ himself in Matthew 5:17-20. “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill (meaning to fill full of meaning and enforce) them. I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. Anyone who breaks one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven. For I tell you that unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven.”
The Pharisees thought it was a good idea to add to and take away from the law with their “traditions of the elders.” They defined righteousness apart from the Law of Moses. We will have to do better than that to make it into the kingdom of heaven.