They keep on playing with the occult and it won't be long before they find out how wrong they were!
Satan does not need to manifest as a physical body in order to inflict great harm. Both good and evil are forces of energy, like electricity. You can chose to draw from one life energy source over the other. Some are foolish enough and weak enough to worship the power of the dark side, the type who praise Charles Manson or defend Dr. Gosnell the abortionist. God gave us all a free will as sentient beings, higher than snails and bacteria. Chose evil at your own peril. Often, he who lives by the Devil, is eventually destroyed or absorbed by the Devil.