Paralipomenon:
Satan: I challenge your rule!
God: Okay, you can have the chance to challenge it.
God: Oh, by the way, I've already seen the future, I win then I kill you.
Actually (at least according to JW theology) God will have to kill Satan first and only then can he win. At the moment, Satan is winning by a factor of a thousand. Of the 6.7 billion people alive on eareth right now, 6.694 billion of them are following Satan. The tiny percentage following Jehovah is statistically insignificant. But being a capricious bastard, God intends to cheat by killing all those who chose not to follow him and then declaring himself and his band of merry men the winners.