I know that this can be a thorny issue in light of the clarifications that Jesus makes on the Mosaic law. In one case, he prevents the stoning of a woman by asking the crowd to confront their own sins. In another he clarifies the meaning of working on the Sabbath. But in many cases Jesus is very careful to not directly contradict the Old Testament law. It seems to me that a direct adherence to the word of the Bible would require the following of all of the laws, not a select few.
People often follow the ten commandments with great rigor, but dismiss the lesser ones.
Many Christians do not even know that the latter statements are in the Bible, probably because they are selectively de-emphasized by Christianity. In fact, Christians often criticize Muslims for carrying out the Deuteronomical commandment to kill people who try to turn you from God. I guess I wonder who decided which commandments were to be followed explicitely, and which were not. It seems to me that one would be playing a dangerous game to try to second-guess God. Neither is there a statement that the Holy Spirit and God are the same thing.