You and I both know there is not a scripture that has the words "a Christian cannot be possessed".
Nor is there a scripture that says "a Christian can be possessed".
True.
There are no examples in the Bible where a born again Christian was possessed.
There are no examples in the Bible where a born again Christian was delivered from possession.
Debatable. Or rather, undebatable, because those who have already decided this to be the case would refute every example offered as possibly indicating this. I do, however, think a grave disservice has been done by whomever started the horribly damaging and superstitious lie being taught in many deliverance "ministries" today that Christians should not cast demons out of unbelievers because they will only end up worse off in the end. If we intend to count the man with a deaf & dumb spirit, the boy thrown into fire and water by an unclean spirit, the demoniacs in the synagogue disrupting services in Jesus' day, and the fellow known as "Legion" himself as all having been "unbelievers" then we have to openly admit that Jesus certainly did not hesitate to cast out their demons and heal their ailments whatsoever, and He bade us, "freely you have received, so freely give." (Matthew 10:8). Paul apparently did so as well, in the case of the oracular slave girl of Acts 16. In none of these cases did a confession of faith in Christ get extracted first, either ... nor come to think of it, later.
Scripture says that if God be for me who can be against me, he always causes me to triumph in Christ Jesus. no weapon formed against me will prosper.
But it does not state no one WILL be against you. It does not state no one will press war and strife in your face. It does not state that you will never be attacked, nor, frankly, that you will never be harmed or maimed in the process. It simply assures what we all know already: that ultimately Christ is victorious, will be victorious, and all our troubles will be brought to an end with ourselves whole, happy, healed and restored. Which might not be in this lifetime for some of us, but will indisputably be the full inheritance of the redeemed for eternity.
The scripture backing for "no possession" is strong and mighty.
Not really. A lot of this depends on how those verses get interpreted and applied, and a lot of THAT depends on attaching eternal promises to temporal circumstances. For the devil to SUCCEED in the ultimate sense, as in to triumph over Christ, he would have to be able, plying his full wares, to drag us to hell whether we will or no, and to do so in a manner that forces God's hand to be removed from us. The latter, we are promised by God, is simply impossible as He will never leave nor forsake us, no matter how we feel or what things look like. But Christians can and do face very dark trials and circumstances indeed in this world, from hatred by our supposed brethren to destitution and poverty to sickness and ailments and afflictions to disasters and misfortunes just like Job. These things touch us, impact us, cause us pain and suffering. Does that mean Satan triumphs? No. So why can we not understand demonization to be just another form of misfortune?? Why can we not simply put aside this superstitious fearful assignment of demonization exclusively to some realm indicative of God having forsaken us, and simply recognize that just as losing one's home to fire or getting canned from work or tossed onto the street or having a spouse demand divorce or a child turn on one in rebellion or cancer grow in one's guts or OCD overtake the mind does not mean God forsakes or abandons us, so also does it happen in cases where the affliction or misfortune is not those things, but being "invaded" by demons? Because truly, what the demonized person needs most in this world to hear and to know, would not be "I can prove by scripture that your situation does not really exist," but rather, "I can prove by scripture that
in spite of what you are suffering -- which is most certainly every bit as real as cancer, destitution, or homelessness -- God has not abandoned you, has not forsaken you, even now, even in this thing, and has a plan for your life to give you hope and a future."
The scripture given for "yes possession" is mostly examples of people that were not Christians.
Were true believers in the one true God any less validly His at any other point in history? If so then someone needs to inform blessed Enoch, Elijah, David, Joshua, Moses, and others that they cannot have eternal life because they did not use the term "Christian" to describe their relationship to God nor have a complete understanding of the plan of salvation and the Messiah to come.
Or, a scripture in which "taken captive" does not translate possession.
What does Jesus mean, then, when He speaks of being the one anointed to set the captives free? What does it mean, exactly, to be taken captive by the devil
to do his (Satan's) will, if not to some degree becoming controlled by Satan or whatever demons he employs to do his work in a person's life? Seriously, the "anti-" side of this debate is coming perilously close to sounding like those who argue that no enemy exists at all. And last I heard, that was a very dangerous position to take (but not one unfavorable to the devil's agenda, I'm told).
The position that a Christian can be possessed is a weak position that uses scripture that is not relevant.
I'm sorry but all scripture is relevant, and putting a spin on relevant scripture to make it appear irrelevant does not constitute establishing its irrelevance by any stretch of the imagination. One does not "win" an argument by pre-emptively claiming victory based entirely upon one's subjective presuppositions and the labor expended to assert them.