Satan exists in the mind–in the human mind that knows both ends of the spectrum of being. There is pain and sadness, just as there is health and gladness. You ride between the two, back and forth constantly. Is there a God and a devil, or is there simply Love and a lack of it?
Love is all there is–one great spectrum of vibration of God-ness. The less you allow the expression of this healing Force to be present in your consciousness, the more pain you feel, the more fear you feel. When you wallow in the absence of the Force, you give all of these lower aspects a name: the devil. There is no such being and no such power.
There is only one Force, one Power, and that is Love. Call it what you will, but call it into your life and the devil be damned. Love is all there is. See it. Be it. Express it, and watch your life flow.