The existence of evil in humans is enough proof - the existence of a satanic being influencing humans to do and think atrocious things. No other animal is evil. Only humans. No animal would utterly destroy the environment it needs for life; that its offspring will need. Only humans. Something is influencing humans. That proves the supernatural spirits are real and that God has rightly called out one of them as evil, liar and murderer. Humans are too evil to have worked that out. There must be a God for light like that to be shining in darkness. See John 8 - there is your proof.
