Man's sin had joined him to Satan.

..........Colossians 1:13
Who hath delivered us from the power of darkness
..........Ephesians 2:2
Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
..........1 John 3:10
.....the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.

Now he stands before God, not only politically as a subject of Satan, but as one in union with him.