That doesn't make any sense:

(1) God is omnipotent, and Satan should have known that rebelling against an omnipotent being is futile.
(2) God is omniscient, and Satan should have known that trying to plot in secret against an omniscient being is futile.
(3) God should have been unafraid of the rebellion, since he could have easily defeated it.
(4) God should have vanquished Satan to stop him from doing evil deeds, instead of rewarding him with a whole dominion full of souls to play around with as he pleases.
(5) If Satan is really bent on rebelling against God, he would treat kindly the souls in his dominion, so they will be swayed to his side and join his army voluntarily. He wouldn't torture people's souls for doing stuff God doesn't want them to do. He should be pleased with all the souls who turn away from God.