Satan was not the Serpent. He actually was the only one in that story telling the truth. In that story the only one who sinned was god by telling Adam and Eve a lie.
And now we come to the Fall. Yahweh had said back there in chapter 2:17, regarding the fruit of the tree of knowledge, that "on the day you eat of it you shall most surely die." The Serpent, on the other hand, had contradicted Yahweh in chapter 3:4-5: "No! You will not die! God knows in fact that on the day you eat it your eyes will be opened and you will be like gods, knowing good and evil." So what actually happened? Who lied and who told the truth about this remarkable fruit? The answer is given in the next verse:
22 Then Yahweh God said, "See, the man has become like one of us, with his knowledge of good and evil. He must not be allowed to stretch his hand out next and pick from the tree of life also, and eat some and live forever."
Get that? Yahweh himself admits that he had lied! In fact, and in Yahweh's own words, the Serpent spoke the absolute truth! And moreover, Yahweh tells the rest of the Pantheon that he intends to evict Adam (and presumably Eve as well) to keep them from gaining immortality to go with their newly-acquired divine knowledge. To prevent them, in other words, from truly becoming gods! So who, in this story, comes off as a benefactor of humanity, and who comes off as a tyrant? THE SERPENT NEVER LIED!