Traditionally in Christianity evil is seen merely as an absence of good. Blessed Augustine makes such an argument in City of God.
"Let no one, therefore, look for an efficient cause of the evil will; for it is not efficient, but deficient, as the will itself is not an effecting of something, but a defect. For defection from that which supremely is, to that which has less of being—this is to begin to have an evil will. Now, to seek to discover the causes of these defections,— causes, as I have said, not efficient, but deficient—is as if some one sought to see darkness, or hear silence. Yet both of these are known by us, and the former by means only of the eye, the latter only by the ear; but not by their positive actuality, but by their want of it."