Deicide is the killing (or the killer) of a god. The concept may be used for any act of killing a god, including a life-death-rebirth deity who is killed and then resurrected.
Nietzsche, as a mid-19th-century German philosopher, first declared God dead in the context of this idealism. He might just as well simultaneously have declared "reason" dead. Indeed, he did just that.Peb 7, 2012
