Not sure I'm following. Are you saying the devil was in heaven at the time Adam and Eve were in the garden and that he has remained there until recently?
I am saying you should read Chapter 12 of the Revelation. Remember that Satan is an angel. He is even transformed into an angel of light (2 Corinthians 11:14).
But the theme of my argument has been that the current war against Christianity was prophesied, as in the following excerpts:
In Revelation 12:7-10, it reads, ". . . there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven. 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. And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night."
In Revelation 12:12, it reads, "Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath, because he knoweth that he hath but a short time."
In Revelation 12:17, it reads, "And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ."