This was a thought i had ever since i was 10 (probably more),
I'm aware of christian demonology having a great amount of demons and infernal beasts, some (i'm aware) came from many religions, for example the most commonly used depictions from the devil (the goat with the trident and pentagram) has similarities with pan and neptune's trident from the roman/greek mythology, the pentagram i saw on discovery channel that was used as protection charm by christians until it was forbidden and demonized it. Or traditions, like halloween.
I understand that the idea of the devil would still be needed to blame the life's down but, IMO, that if christianity hadn't had spend so much time demonizing other cultures and religions, it would be difficult today that thigns would be categorized as "of the devil" so easily.
What are your thoughts?