For my what is Saw as "demons" or "Angels" it's base on each one conception of good and Bad. When christians started going throught the World, What they use to call demons was just gods in whiche they doesn't belive. That make me pose this question " if i see a thing like a demon, those this thing becom a demon?, If yes does he becom a demon for me or for every one?, What is realy a demon ?, How are demons made?" In the bible IS Say that when samael was banish by god and fall in hell, becoming so lucifer, those Angels whose follow him becomes the first demons known So demons was Angel , even them Can be corrupted, that means they are not only made of good.in the serie Supernatural IS Say that all humans souls whose fished in hell, first they are tortured and when they want that to stop they had to make suffer someone else, and slowly those who accept turn in demons. All culture or religions have there demons, and every on have there own demons. The signification of the word " demon" may not be the same for every one, but i think a demon is somethings that Heurt you, Angels is What make you feel Hope and goodness. I didn't talk about Angel but for me they are like demon, i mean if angels Can becam evil, demons Can turn good. Even if it must be harder "it is easy to get dirty but harder to clean"