Nowhere in the Bible that says a "Christian" can have a demon

There is nowhere in the Bible that says explicitly that a "Christian" can have a demon. But it does talk about "believers" having demons. Are you a believer? What is the difference? None! 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 thousands of 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 fivefold 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!  

We have seen leaders go into false doctrines. These can even be leaders that cast out demons. It appears that pride is their downfall. Pride is an abomination to God and is an active demonic area.

Moody, Gene B. The Complete Deliverance Manual (p. 2). Gene B. Moody. (Not copyrighted)