The Importance of the Law

I've heard that there are some people in America these days who are saying that in order to be a good Christian we must just abolish the Old Testament and forget it. How on earth one could say that I'm honestly not sure but I'm going to be doing a conversation fairly soon in a big American church about this issue. The law is given Paul says from Moses to the Messiah to keep the chosen people from as it were going bad until the coming of the Messiah. So for Jesus to abolish the Sabbath and notice that in the rest of the New Testament every time somebody summarizes the Ten Commandments they miss out. Sabbath never mentions it and never mentions it as part of the commandments because it