Cofty, my apologies for the condescending tone. I think we are simply speaking past each other, as you are talking about the "L"aw, and I am speaking of the shore laws and various others that were implemented by Judaism to prevent violating Mosaic Law.
I think Randy wrote a pretty good post about what Jesus meant by "fulfilling the law." These are the kinds of things that, much like any Shakespeare novel, are in my opinion open to interpretation and debate, but is so often looked over by those who can view it from an objective standpoint (no religious bias). This is one of them. What is meant by fulfilling the law?
Again, while there are some minor contradictions in the new testament, even between Jesus and the apostles, but the overall gist I pulled from it was that Jesus came to abolish the Law, including Mosaic Law; otherwise, as you mention, Christianity would simply be a Jewish sect. So it seems a lot rides on this concept quite heavily. Jesus said that the entire law hinges on two things: to love one's neighbor as himself, and to love God with all of one's heart.
There is a vast difference between the God of the old testament and of the new testament. One commands to hate those who oppose him, the other to freely forgive all. One has freely forgiven sinners, the other kills on a whim. One judges based on action, the other on heart condition. To say that Christians follow the same God as Jews at the time did appears simply to be false.