[Dargor]

According to religion they were once angels or non-human entities but to me it makes no sense that angels would rebel against God while they are aware that they don't stand a chance against God at all. And what would cause such a high being of great intelligence who stands in close proximity to God to go evil? In another (more likable) theory, demons were once ordinary human spirits that over time gathered a lot of power and transformed into truly monstrous beings. But what is the actual truth and where do they come from?