Jesus did not intend a new religion. He intended to calm the rising against Rome by reminding everyone of the spirit of their religion -- to remind everyone to love God and your neighbor. That wasn't new, but the Sadducees were far into worldly matters with Rome, the Zealots were becoming more unpredictable, and Jesus was trying to teach, through the Pharisees, the masses, that worldly matters were overtaking their commitment to God. The Good News was that the Kingdom was in their midst...calm down and look inside for peace and stability with God.
All the rest was additions to make something that wasn't. But we can be grateful Jesus was kept "alive" in that his actual message remains relevant for people of All Faith's.