From the article:
“If you want to understand demonology, look no further than Jesus Christ. He cast out demons, and gave that power to his disciples. The demons bowed before him, knowing who He was. They could not stand before the power of the Son of God, knowing that He was their judge. Even when it appeared they succeeded in having the crowds turn on Him and crucify Him, they could not keep Him in the tomb; when He arose, he triumphed over them finally and forever. In Christ, Satan is powerless to possess a Christ follower. That doesnt mean that we should ever give him any opportunity, because Satanic forces can oppress believers though not possess anyone indwelt by God the Holy Spirit. Christ is the word that triumphs over Satan, as Luther wrote in A Mighty Fortress Is Our God
And though this world, with devils filled,
Should threaten to undo us,
We will not fear, for God hath willed
His truth to triumph through us:
The Prince of Darkness grim,
We tremble not for him;
His rage we can endure,
For lo! his doom is sure,
One little word shall fell him.
That word above all earthly powers,
No thanks to them, abideth;
The Spirit and the gifts are ours
Through Him who with us sideth:
Let goods and kindred go,
This mortal life also;
The body they may kill:
Gods truth abideth still,
His Kingdom is forever.”