Oh this is so easy I'm surprised no one else has chimed in.
Thanks to what was supposed to be the first expression of free will to openly chose to serve their own ego and want to be God unto himself; Lucifer and conceive the grandest delusion of all time ; that a rebellion was even desireable, forget possible.
Consider Lucifer ; one of the greatest beings of Light , it was his gift to be , sqandering his gift in the sevice of the greatest ego of all time that caused him to become the greatest parasite of all time as he draws his continued existance from the light he is a master of extracting from countless other beings of light ensnared into the excruciating limitations of a mere "biological life".
Lucifer , deluduing himself by the fact that he had incredible knowledge to manipulate the Laws of Nature in Matter that he was a creator unto himself has given all us:
Our sense of doubts, suspicions , terrors , sense of being left behind ,somehow and doomed to endless cycles of livng in an empire of flesh with *all* of its frailties and , thus , manipulated by all of its *appetites* become addictions from bloodlusts to to depravities to degeneracies and be conviced along the way that it's all just the way things are supposed to be. Further ; to raise it to the level of a passtime, a sport , even high fashion.
Lucifer gave us rape, torture ,slaughter , war and all of the self-doubts that lead to the "to hell with the world I'm gonna get what's mine" reptilian-branied agressiveness alloyed with the serpentine seductions and incitements, in a word "the lie", that this is all life is about and thus to get others to commit all the attrocites for you at their risk.
Satan is the greatest source of mankind's continued cycles of misery , loneliness, dispondency, fear , suspicions, paranoia , and all of the other pathologies prevents awareness of our original spirit nature and have leead to all of the well-practiced skills for "doing unto to others before they do unto you".
Thanks, Satan , literally for nothing.