Who then tempted Jesus in the wilderness?
You are not going to get anywhere with this fellow. Probably no one spoke more of Satan than Jesus, and yet HisWitness does not believe. There is nothing you can do when a person does not believe scripture.
Rev 12:9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
It is clear that the serpent in the Garden of Eden was the Devil, Satan, the person who deceived Eve and who deceived the whole world.
Now, Satan is not cast out of heaven yet, he still has access to heaven. Here in Revelation 12 he is kicked out once and for all.