Simple Definition of Deliverance: the state of being saved from something dangerous or unpleasant. Deliverance is the last battleground to complete freedom of the Christian. The battle is the greatest and Satan will fight the hardest against this ministry. You are fighting God's battles; you are cursed if you are unwilling to fight.
There is nowhere in the Bible that says explicitly that a Christian can have a demon. But it does talk about believers having demons. If you are a believer, you are a Christian! The multitudes that came to Jesus received deliverance; some were bound to be believers! You can memorize the Bible and go to Hell. No part of the Bible is any good to you unless it is used! Head knowledge will not get you to Heaven; it takes heart knowledge. Bible scholars can argue about theology until Jesus comes again and not settle the question of whether a Christian can have a demon; it takes experience. When you start casting demons out of people, you find that Christians not only have demons but they have many demons!In our years of ministry, we have worked with thousands of people - small groups to large groups. We found that the congregation could have many demons. Then the Lord started us working with pastors and their families. We found that the five-fold ministry also had almost as many demons as the congregation. Finally the Lord had us to work with deliverance ministers. We found that they also had quite a few demons too!