Here are some questions that hit me:
1. If a man dies, can he become a agent for God or Satan? Sort of like a Co-Demon/Co-Angel?
2. Is it possible for a man to become a Agent to Satan? I mean, if a man can become a agent of God (preacher/priest/w/e) couldn't it be possible in turn for them to become a man of Satan?
MY COMMENTS:
Answers on 1. No! When a man dies he is dead until resurrected.
In death, the grave, there is no knowledge, no remembrance, no praise etc:
Psa. 6:5 "For in death there is no remembrance of thee; in Sheol who can give you praise?"
Psa. 30:9 "What profit will there be in my blood when I go down to the pit? Shall the dust praise thee? Shall it declare thy truth."
Psa. 88:10-12 "Will Thou show wonders to the dead? Shall the dead arise and praise thee? ...Shall thy wonders be known in the dark? And thy righteousness in the land of forgetfulness?"
Psa. 115:17 "The dead praise not the Lord, neither any that go down into silence.
As the Lord told Adam after the fall, "By the sweat of your brow you will eat food until you return to the ground, since from it you were taken; for dust you are and to dust you will return." Gen3:19, NIV.
2. If a man was a believer in christ and was indwelt by the Holy Spirit, and was a preacher (agent) for God, he could never change and become an agent for Satan.