Jesus is not Jehovah--in fact, the two couldn't be farther apart in teachings. Jesus became as God, first to himself, and then to those who he was teaching to break away from established religion. From what Jesus taught, when taken as parables that were intended to help people break free from the "do as you are told" mode, the root of all sin was laziness, dishonesty, and envy. From these came stagnation (the result of all real sin), and all the other "immoral" practices. By attacking the laziness, dishonesty, and envy, Jesus sought to cause the foundation of all other immoral acts to crumble, and that would have in fact been the end of all sin.
By comparison, Jehovah taught people that they had to do as they were told, regardless. That teaching actually promotes laziness. Lazy people often become dishonest and/or envious, and if Jehovah Himself had those traits, He couldn't have not spread it to those under Him. Under that system, parents were required to pass these three sins onto their children (there was even a law that required parents to make their children do as Jehovah told them to). What is actually moral perfection, by the corrupt standard of Jehovah, becomes "sin", creating the illusion of inborn imperfection.