So, you have been led to believe that evil spirits come from the devil. Guess again. They come directly from the Jewish/Christian/Muslim god himself. Let's check out the Old Testament:
I studied the A Course In Miracles for a number of years and I will admit, there's a lot of good stuff in it. But is it Truth with a capital 'T'?
http://bit.ly/29bRWaA “This is the true joy in Life, the being used for a purpose recognized by yourself as a might one…the being a force of Nature instead of a feverish, selfish little clod of ailments...