A few Sundays back our New Life locations were teaching from Mark 1:21-28 and we talked about demons. Incidentally, one reason I like teaching straight through sections of Scripture is that it forces me to teach on tough, easily neglected and important topics. Unpopular topics like demons and demonic possession.
I got some questions seeking clarity and I thought I'd share them here figuring that others were wondering about similar things. So verbatim from email response:
Second, regarding the possibility of a Christian being possessed... That is a more complex question. Can a Christian who is indwelt by the Holy Spirit be under the internal, possessed lordship of a demonic spirit? No. But, can a Christian be so demonized that the difference between him and the demonically possessed non-Christian is difficult to distinguish? Yes. In other words, the sense of fear, helplessness and defeat from the believer who is pushed around by an evil spirit is not a small thing. Erwin Lutzer has a great section on this topic in his book Serpent of Paradise. I'd recommend it to you for further study.