They can be “buffeted” by messengers of Satan as Paul described, they can be allowed as a “thorn in the flesh” that Christ won’t necessarily remove right away, perhaps as if to say, as Christ said to Paul(when he besought the Lord 3 times to remove it)...”My grace is sufficient for you”. Paul said it was to keep him humble before God because of the many prophecies and gifts God had wrought thru him.
So our internal selves can’t be possessed. Yet we can be tested, tempted and harassed even with the tolerance of Christ or his grace for disciplinary purposes. It forced Paul to stay close to his savior.
King David as Chronicles states was tempted by Satan and was induced to order a kind of census that the Mosaic law forbad. God’s purposes were to punish the nation of Israel,(not necesarilly David interestingly enough), literally the people for their faithless to him. It would take David’s offer of self sacrifice and his building an altar for animal Sacrifice before the Lord to stay the hand of God as the plague had killed 70 thousand lives in Israel.(consider 200 thousand people killed by corona in the US with a population of 338 million souls)
Errant Christians can even be given over to Satan for the destruction of the body so that the spirit will be saved in the day of Resurrection as Paul also says.
So the biblical record is rather interesting in the telling of demons, spirits and Satan in terms of how and why God uses them or allows them to interact even with mighty believers. And if God does so with his chosen mighty believers, one can only accept that he allows certain controlled interactions, for his own purposes, amongst the smallest of us.
The church at large may be on the thresh hold of an expansion of power and a renewed knowledge of the authority it has in Christ while facing at the same time increased persecutions because of that renewal. Where lawlessness abounds, grace abounds more.
It will happen perhaps when some certain believers or leaders whom God has specially chosen lay prostrate before God asking that their lives be taken on the spiritual altars, if it might mean that the salvation of all humanity might be realized.
***Some experts have posited that David’s building of his altar on the threshing floor of Ornah(at Jerusalem) was at or near the place that our Lord was crucified. What wonderful foreshadowing....David interceding for the people and later Jesus, son of David, son of God and LOGOSGOD made flesh, dying in order to become our intercessor before the father who pleads for the souls of Men!
It will happen perhaps when some certain believers or leaders whom God has specially chosen lay prostrate before God asking that their lives be taken on the spiritual altars, if it might mean that the salvation of all humanity might be realized.
That amounts to a demonic approach. God will never permit this. No other human than Jesus of Nazareth, God Manifest In The Flesh, can alone satisfy The Father's standards of perfection of a sacrifice. He is the only Human able to declare the New Coven=ant in His Pure, Perfect Blood.
Jesus died once, for all and for all time(Heb. 10:10). He says to each individual, essentially, "Choose or choose not; there is no after-death reprieve."