A whole lot of FAIL in this thread....
Let’s take a look at what Judaism has to say about Satan. In the Genesis account of creation, we are told that G-d saw that each day was good, but on the last day it says that G-d saw that everything was VERY good. The Talmud teaches that this refers to the Evil inclination, which it equates with the Satan. Why is this good? It is the Evil inclination that provides our passions and desires, it is the evil inclination which is responsible for not only all the evil that transpires in this world, but also for all the good. For if we did not have passions, appetites and desires, we would also have no motivation and we would accomplish very little, either good or bad in this life.
If you look at the use of Satan in the Hebrew bible, you find that as a concept, it is much more about an experience than a person, an experience where G-d has put a roadblock in front of us. This is Satan, this is an adversary. So why is this a good thing? Because if we were to go through life without ever experiencing these roadblocks or adversaries, obstacles in life, there would be no potential for virtue in the world. For if we were never tempted to do the things that we are not supposed to do, then not doing them would be of no value to us. It is only in coming up against a desire to do what is wrong and overcoming this that we grow as spiritual people.
This evil inclination, or Satan, provides friction. Can you imagine a world with no friction, no resistance? Think about a car, how does it go? It is the friction between the tires and the road that allow the car to make progress, to go forward. Now, to the tires the friction is not necessarily a positive thing, the friction slowly destroys the tire, and yet without the friction, the tire is worthless.
If there is no resistance to overcome, we have no environment for growth. When we come up against an obstacle, either we crash into it and fall (definitely a negative experience – the evil inclination) or you have to climb over it, and by climbing over these obstacles in life, we develop our spiritual muscles, so to speak. If we never exercise our muscles, we atrophy. So these forces in the world, these experiences, no matter how difficult or uncomfortable, are positive and important.
To reiterate, in the Jewish bible, everything was created by G-d, both good and evil and everything is under G-d’s control. Only one force, not two, whereas, in Christianity Satan is not under the control of G-d but is rather, a competing force against G-d. Christian theology makes Satan so powerful that he is given the title, “the god of this world.”
This sets up a situation in Christian theology whereby Jesus must come and accomplish something to help us get out of the difficult situation – to overcome Satan, since he is at war not only with G-d, but with us. However, Judaism teaches that what is to be overcome is not Satan, but the “satan” in our path, the obstacle which has been put there for our growth.
So, to reiterate, in Judaism Satan is an agent of G-d, who provides opportunities for us to grow, to respond to our passions and desires by producing things of value in this world and to become stronger spiritual people.
http://www.jewishanswers.org/ask-the-rabbi-2566/the-jewish-view-of-satan/?p=2566