There was a preacher that went to Indonesia and stayed at the home of a lay witch doctor who was possessed of seven devils.
While the doctor was a work one day his wife said she would show the preacher how he communicates with his spirits. These spirits hated his wife because she was a Christian. She had to sleep in another room because if she tried to sleep with her husband, these spirits threw her onto the floor. She had bruises on her body as a result.
Now we may not understand things like that, but a lot of people in America are beginning to understand the devil's power.