Scroggins and leaf,
I hear what you are saying and thank you both for helpful clarifications. particularly with regard to not challenging a person's belief system, who claims to be a Christian, right when they need help to win against the enemy.
However, I testify to you in Jesus Name, that the body is not an empty vessel like a cup, which is either partly full or full of the Holy Ghost only, or, has nothing spiritual in it, or, has bad spirits in it, or oppressing it.
Bad spirits do (or can) affect [i]parts of the body[/i] with specific bondages due to past sins or invisible injuries, which Jesus Christ can free [i]the body[/i] from, if the person is willing.
I 'hear' that the word for 'possession' is not in the Greek, and I can go along with that, because the Holy Spirit is always going to be more powerful than a demon. But exactly [i]because[/i] the Holy Spirit is always more powerful than a demon, there is, in my understanding, no conflict in the thesis that the body can be a battleground, whether a Christian's body or a non-Christian's body.
There is a great verse at the beginning of Psalm 24: The earth is the Lord's and the fulness thereof.
If you can bear with these two pictures - the earth - Adam, formed from the dust of the ground - and Canaan, the promised land - [i]both[/i] were inhabited by 'an enemy'; Adam, by sin - a spiritual enemy - and Canaan, by giants - a physical enemy.
Can you see, using these two pictures, how the liberation of Canaan into Israel's hands, is a picture of the liberation from domination by sin, of the human body? The overcoming and slaying of 'enemies' - strongholds, as Paul calls them in 2 Cor 10 - is part of the normal Christian life.
Most of us have strongholds that cross between the mind and the body - attitudes to what we might legitimately think / think about, or how we might spend our time [i]doing[/i] what we like, or are accustomed to doing. All this has to be challenged by God, in His timing, and we have to capitulate to His will to set us free.
Simply because Paul does not mention 'demon' in his reference to casting down strongholds, does not mean there is no spirital influence in them, but, I fully agree that God [b]places[/b] victory in our hands, should we wish to lay hold of it by the blood of the Lamb. (Heb 10:14)
I do see the blood as instrumental in winning the battles. While [i]will[/i] is involved - that is, we do have to [i]decide[/i] we want victory - the battle is spiritual, and won only through the blood. Our [i]willpower[/i] cannot free us, by hard work alone.
Many Christians, it seems, do not really understand they can be set free from the propensity to sin. This seems to be because of crazy doctrinal disputes, which move them off the ground of scripture, or, of a lack of knowledge of scripture, or simply not being able / willing to believe it when preached properly to them. I don't know. I'm only guessing, really. I just know what God has done for me, and that if He could deliver me, as a Christian, from all that was thrown at me and found a resting place in my life, then, He can deliver anyone who wants His liberty.
2 Corinthian 10
3 For though we walk in the flesh, we do not war after the flesh:
4 (For the weapons of our warfare [are] not carnal, but mighty through God to the pulling down of strong holds;)
5 Casting down imaginations, and every high thing that exalteth itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ;
6 And having in a readiness to revenge all disobedience, [b]when your obedience is fulfilled[/b]. (KJV)
Fulfilling obedience, is the same picture as bringing forth fruits meet for repentance. God expects to see a change working through to one's outward life, where others also will see it.