Definitely Paul meant in this verse that mankind is not the children of God but have a different line of blood from God. Since the fall, Satan has ruled the world in a pseudo form of the Divine Principles. Now is the judgment of this world, now shall the ruler of this world be cast out. In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the Gospel of the glory of Christ who is the likeness of God. With the accumulation of man's sin, the power of Satan and the number of his subjects increased.
All evil spirits are men who have led wicked lives on earth.
Therefore if no evil person is left on earth to work with, Satan loses the base on which he stands and accordingly he becomes powerless. Then Satan entered into Judas called Iscariot, who was of the number of the twelve. You are a hindrance to me for you are not on the side of God, but of men. All these are the members of Satan's kingdom. Many people do not know about this and consider the work of the devil merely some kind of psychological disturbance.