The pharisess (I doubt all) had become hypcrites; rigid and loading people up with burdens that they could not bear. Why else would Christ tell people to come to Him, whose burden is light? Why did he condemn so many things in the pharisees and teachers of the law, if they were doing everything according to truth? Why did he tell them that they were not entering the Kingdom, and they were not allowing anyone else to enter the kingdom as well, if they were right?
There was nothing wrong with the law... but the abuse of it (the traditions that actually took away from the law), the lack of mercy or love being shown (in violation of the law)... these things He condemned.
He helped to free people from that yoke. A lie is a lie, regardless of whether one is Christian, Jew, Hindu, Buddhist, Muslim, Pagan, Some other form of spirituality, or Atheist.
Peace,
tammy