The Theory Of Demonizing
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The theory of demonizing demonizes anything or any body who's not of their beliefs.
Having different beliefs was not ok. You couldn't disagree because all beliefs were thought to be the same.
These people felt as though ONLY their point of view was correct. Anything else that wasn't of that religion. You were considered to be enemies of God if you opposed. Those who did not believe in the true faith were attacked, persecuted and even killed. We should all value everyone's perspective or point of view. Every one may not believe the same things as you. You can still feel Godly without demonizing others beliefs.
Bibliography: The Origins of Satan. Elaine Pagels (1995)
Vessils of Evil, Chapter 6. Lawrence Mordekhai Thomas (1993)