The first thing that Satan does is he questions the Word of God. Satan is constantly seeking to create a question. Did God really say? Is that really God's word? And look at the attacks that Satan has brought against the Bible. Satan entered the serpent, a real creature, for the purpose of deceiving Eve. The tempter used his craftiness to cause them to sin. God permitted Adam and Eve to be tested, but He certainly did not encourage them to sin or force them to sin. They could have resisted the temptation if they so desired. Ultimately it was their fault for not resisting the temptation.