We are commanded to drive out demons, yet Jesus warned that a demon when cast out would wander about till he decides to return, whereupon he finds the house empty and available. This should be a warning that it is unwise to do deliverance on unbelievers because they have no defences against a demon returning. ie. the ministry of deliverance is primarily aimed at setting believers free, not unbelievers..
Apologies in advance; I meant to write a short response but ended up writing a whole epistle. God bless anyone who finishes reading it 
I think you have to be lead by the Holy Spirit at all times. But if my pastor had not commanded the demon that had been posessing my mom for over 5 decades (and the three other demons that were with him) then she would not have been saved, an neither would I, and two of my sisters. Neither would my niece and two nephews have received the grace to now learn to know God and to grow up in a God fearing, anointed church. So through delivering my mother, 1 unbeliever, now 4 adults have come to Christ.
My mom came to church in september 2019 only because she was giving my cousin a ride. She had no idea her life was about to change forever. After service, the pastor offered to pray for her. Skeptically, she allowed it. (This is truly a church of the Lord; the Holy Spirit leads and guides the sermons and everything; the pastor is very much in tune with Him.) a few hours later, after these 4 demons were cast out, she fell on her knees and gave her life to Jesus.
A few days later, she showed the footage to 3 of her daughters (
this church deals with stuff like this all the time, so when deliverance starts (sometimes impromptu like with my mom) someone starts filming so that the subject will be able to know what happened afterwards) and asked us to please come with her. We were shocked. Not christian at all, I was living a sinful life and didn't even believe that Satan existed. Whenever I had encountered videos like this I had always laughed at the (in my eyes) naïveté of christians. I knew my mother had had a disdain for christianity as well and was not at all "hysterical" like I believed those people to be who I had seen in videos.
Yet here it was right in front of my eyes: my mom's body but these demons were speaking through her, each with different voices and mannerisms and personalities, contorting my mother's voice in ways I had never heard before...
And all that the pastor and prayer warriors were using was
the name of Jesus. That just shocked me. No weird ritual, no witchcraft rites, no potions or candles or whatever. No, it was an anointed ministry and the presence of God, and when they commanded the demons "in the name of Jesus"; that was what it took. This was the first time I encountered the power in the name of Jesus. It astonished me. We came with her the next service and have never left.
I've seen so many things happen. Chains breaking. Demons being manifested by te presence of the Almighty God, and cast out. Witchcraft exposed and destroyed. God is great. Wow, how blessed am I to be able to know all this. My aunt also comes, and a good friend of my mother and a friend of hers. So now through the deliverance of this 1 unbeliever a mass of 10 people was added to the church. 10 souls. God is good.
I always think of Genesis 50:20 when I think of my family. That demon thought by posessing my mom as a child he had won, but look how God used that evil for good! Bless the Lord. Now I think to myself: if I were this specific demon (or Satan who he works for) I would've seriously regretted ever possessing her. Because if he hadn't done it, maybe we all would still have belonged to the kingdom of darkness for not knowing Christ. But now 10 souls have been added to the kingdom of God, hallelujah! So what he meant for evil, God used for good.
I could type forever. I really only meant to write a small paragraph in response to the quoted, but it got a little out of hand; pardon me...
Anyway, I also wanted to add that I've also seen the other thing happen. We got one uncle of mine (who I highly suspected to also be subject to demonic forces) to come with us. But he was in a hurry. After service, pastor and the prayer warriors prayed for him, and there was somewhat of a manifestation. Afterwards he had to go home quickly unfortunately, and there was not really time to really explain it to him. I regretted that afterwards. I believe he might be even worse off now. He didn't really understand what had happened, I think. He went right back to his sinful life and just thought it all strange, and it doesn't seem he will come back to church. It's really really sad.
I've seen with my mom that it really is exactly as in the bible: you cast one out, and he will go out and next time you'll be surprised to find a whole new set of demons he's gathered. You really have to hold on to God, keep pressing on and you need to be filled with His Spirit. He is the only one who gives us the strength. But not every posession is the same. Some go easier than others. Demons are also not the same. Some are higher in rank than others. There is a difference between powers and principalities, and lower demons, for example. And wickedness in high places, this involves witchcraft for example. These all give different problems. And not every deliverance is the same. I'm learning new things every week. Bless the Lord for what I have seen with my own eyes.
But I will say this: GOD has to be center in it all. You can't just search for His power but exclude Him. Many churches are DEAD because their leaders think they have it all figured out with formulas etc. That's very sad. Without God, we are NOTHING. You need to have leaders who are in tune with God, who are led by Him. Too many "pastors" are doing things on their own, and it is very unfortunate.
And spiritual warfare should not be optional, either. Many leaders are fearful. They have that foolish and cowardly "if we don't bother the devil, he won't bother us"-mentality. It will be the end of them if not for an intervention from God. And for their congregation. Because the enemy does not sleep. They like to lay low so that no one will bother to counter them but they are most certainly active. We have to be active and ready also, and wear the armour of God and with that destroy the works of the kingdom of darkness. But most of all, we have to draw near to God, come to His throne, seek His face. He is our strength. Without Him, we are nothing.
