In order to correctly make use of any one word used in the Bible - one Must see How it is used - in context.
This is the word translated "possessed of a or of devils". Looking at these verses in context - these people were Not Saved.
These are the Only places that this word "possessed" is found and these devils 'needed' to be "cast Out" of these non-Spirit filled [unsaved] people.
G1139
δαιμονίζομαι
daimonizomai
Total KJV Occurrences: 25
possessed, 11
Mat_4:24, Mat_8:16, Mat_8:28, Mat_8:33, Mat_9:32, Mat_12:22, Mar_1:32, Mar_5:15-16 (2), Mar_5:18, Luk_8:36
devil, 7
Mat_9:32, Mat_15:22 (2), Mar_5:15-16 (2), Mar_5:18, Joh_10:21
devils, 6
Mat_4:24, Mat_8:16, Mat_8:28, Mat_8:33, Mar_1:32, Luk_8:36
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The point being - that only the unsaved can be "possessed" and need to have the demon(s) "cast out" of them.
Possessed means, indwelling. The losing of one's will to the power of an indwelling spirit. The "faculties" being under demonic "control", **over-riding self-will** - resident-in and 'ownership'.
Demons are "cast out of" the unsaved for the purpose of the propagation of the Gospel.
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Next we would have to look at every verse that contains the words "cast out" [found 37 in the KJV] that is always connected with "possession" to see if we can find ANY instances where 'Born-Again, Spirit filled Christians' had demons "cast out" of them. Whenever there was a case of "possession" the demons Had to be "cast out".
Answer: Never happened with a true Spirit filled Christian in the whole of the Word of GOD!
Truly Born-Again Christians Can "cast-out" demons by His Authority for the propagation of the Gospel.
True Christians Can take authority In Christ over demonic activity.
True Christians need never fear demons or their activity because of WHO is resident within them - as long as they stick to His Word [their Sword of The Spirit], don't go beyond what is written and are not rebelious or have "hate" in their hearts. "Hate" is a good indicator that one is tipping toward danger in their spiritual walk.
'True' Christians cannot be demon "possessed", according to the New Testament.
Satan and his minions have no power over anything or anyone Unless GOD 'allow' it for The Good of His Saints but He will not share His 'temple' with demons.
1Co 3:16 Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you? 1Co 3:17 If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are.
1Co 6:19 What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own?
2Co 6:16 And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell 'in' them, and walk 'in' them; and I will be their God, and they shall be my people.
Romans 8:28,29 stands forever!
Eph 2:22 In whom ye also are builded together for an 'habitation of God' through the Spirit.
"And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ."
Read my signature ... it's His Word. He created, controls and gives restrictions to what demons can and can't do - like with the book of Job - most Especially over His Own Sheep = His Habitation.
The New Testament is such a tiny book Yet so many don't Know it - and that is synonymous with and caused by 'the loss of the love and the fear of The Word of GOD', Who 'is' GOD. No wonder there's no victory or witness coming from "the Church" because we've back-seated His Word to others to sit up front = because we don't Love His Word nor fear Him/The Word of GOD.
"And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him. Herein is our love made perfect, that we may have boldness in the day of judgment:
because as He is, so are we in this world. "