God is good and Satan and demons are bad or are they the same entity?
The vast majority of believers see two separate forces at work—good and evil, the one emanating from God, and the other from the Devil. But the problem is not quite easy as that, for the Scriptures make it clear that God, on a number of occasions, does evil as well as good, while the Adversary, the exponent of evil, may appear at times as a messenger of light, and light in itself is good.
But, again, if we are to say that good emanates from God and evil from Satan, how are we to explain the "tree of the knowledge of good and evil" which God planted in the garden of Eden? Here we have the knowledge of the two things brought together in the same tree, which was planted by God!
But the Scriptures themselves set our minds at rest. In the book of Isaiah, chapter 45, we read, from verse 5, "I am the Lord, and there is none else, there is no God beside Me. I girded thee (Cyrus —see verse 1), though thou hast not known Me, that they may know from the rising of the sun, and from the west, that there is none beside Me. I am the Lord, and there is none else. I form the light and create darkness: I make peace and create evil. I the Lord do all these things."
God is both good and evil. God is all things.