Just to clarify my earlier comment about the Islamic stance, he doesn't have power not given to him by God. Actually, when he was expelled for refusing to acknowledge Adam, he asked God to allow him to live till the end of this earthly life to drag with him to hell many humans. God not only granted him that, but also gave him more power to use on those who don't believe in God and follow Satan. So, now when i recall some verses from the Quran i can see how Satan can be viewed as a being working for God, since this power of deceit and power over those who are not faithful are given to him by God.
(61) And [mention] when We said to the angles, "Prostrate to Adam," and they prostrated, except for Iblees. He said, "Should I prostrate to one You created from clay?"
(62) [Iblees] said, "Do You see this one whom You have honored above me? If You delay me until the Day of Resurrection, I will surely destroy his descendants, except for a few."
(63) [Allah] said, "Go, for whoever of them follows you, indeed Hell will be the recompense of you - an ample recompense.
(64) And incite [to senselessness] whoever you can among them with your voice and assault them with your horses and foot soldiers and become a partner in their wealth and their children and promise them." But Satan does not promise them except delusion.
(65) Indeed, over My [believing] servants there is for you no authority. And sufficient is your Lord as Disposer of affairs.
Quran (17:61-65)
After reading the above verses, please let me know how similar and how different it is from the way Judaism see it.
Thank you again.