The Bible tells us that Satan was thrown out of heaven: "And there was a war in heaven; And the great dragon was cast out, that old serpent called the Devil and Satan" - Revelation 12:7-9
We have collected stories of his coming to earth from numerous ancient accounts. We have gathered scientific evidence of his coming to earth. Satan was indeed thrown out of the heavens. We have the proof. Satan caused great evil on earth. We have come to know him as the personification of all evil.