Wicked Spirit Forces are Factored into my theory. I believe that they have Created the PERFECT deception, by creating Religion and Manipulating Scared Texts, they have brought a tremendous amount of Hatred,Pride & Death into the World.
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A theory is based on evidence. What you have is a hypothesis. What proof do you have that demons exist? And if they do, what proof do you have they've deceived anyone?
Actually, religious humans do a pretty good job of being hateful all by themselves based on the "we're right, everybody else is wrong" foundation of the religious mindset.
Once a person gets away from that thinking (atheists) you can be kind to everyone regardless of their beliefs as you feel no need to win any battles for "god".