Preview Into My Endevour

Imagine the religions had it wrong, and angels were really the jerks and demons were those trying to help the survival of humans. If I can get a strong enough outline I am going to make a novel (maybe even expand it) about this exactly. But, I digress, the idea for this is that, God, Is dead. He was killed by the massive power of the angels he created. And satan and demons, are more like scholars who love the progression of humans. Angels however, fear the human growth, and when they attempt at the apocolypse. Satan is enfuriated by this so it is all out war with angels (which is a losing battle for demons because they have not fought in centuries). Right now I am trying to include humans without making it too cliche as far as books go. I am thinking it will be a group of teens looking for the gates to the underworld, accompinied by an anoying mythology tutor, who swears he has stumbled across a gate into hell.