That is, is God morally perfect, completely good, entirely just, and...
1 John 4:16 - 19
16 So we have come to know and to believe the love that God has for us. God is love, and whoever abides in love abides in God, and God abides in him. 17 By this is love perfected with us, so that we may have confidence for the day of judgment, because as he is so also are we in this world.
Why not simply make Satan do good instead of evil?
When God revealed His plan to destroy the world with a Flood, He told Noah,...
7 So the Lord said, "I will blot out man whom I have created from the face of the land, man and animals and creeping things and birds of the heavens, for I am sorry that I have made them.