Sin is obviously a perversion of obedience. Evil, therefore, is a perversion of good. It does not exist by itself as an entity. Evil is like a hammer. It is not useful unless it is picked up.
Evil, then, comes from us. We are the ones that give it motion, not the devil, nor his demons. They may tempt and try, but they are not the ones from whence it comes. As James tells us, our desire is what makes it happen.
So the goodness and grace of God emanates from Him, it is tangible thing, it is a created order. But man introduced evil by acting contrary to the created order and thereby, perverting the good.
In Christ,
KC