Jesus answered this question in the Bible.
God does not support evil, because a house divided against itself cannot stand.
God is the complete absence of evil.
Satan is the complete absence of good.
He covered this when discussing the propriety of casting out demons.
I know the passage. Jesus had been accused of overcoming Satan by means of evil. He didn’t fit the Pharisee mold which got Him accused of evil.
He ended up warning His observers not to reject Him. That would be the only unforgivable sin they could sin. If we reject the only bearer of forgiveness, there isn’t any forgiveness remaining to have.
The devil is as bad a perversion of goodness (evil is perverted goodness) as exists in this universe. Whether there could be a worse perversion, is a theoretical question, however God hasn’t chosen to allow it. If you beat the devil, you’ve beaten all the evil that can befall you.