THE KINGDOM OF GOD AS WELL AS THE KINGDOM OF DARKNESS ARE SPIRITUAL KINGDOMS.

And as you go, preach, saying, ‘The kingdom of heaven is at hand.’ Heal the sick, cleanse the lepers, raise the dead, cast out demons. Freely you have received, freely give. Matthew 10:7-8
But if I cast out demons with the finger of God, surely the kingdom of God has come upon you. Luke 11:20