These words may not be necessary. Traditionally, many evangelicals have stoutly held that no Christian can ever come under the influence of demons. Almost invariably those who insisted on this had never actually been involved in exorcisms. But with the occult invasion of North America an obvious fact, more and more Christian leaders are being involved in deliverances. And they are finding that sincere Christian believers can and do come under demonic power. Experience, if nothing else, is forcing evangelicals to take a second look.
Merril F. Unger, in his classic work, Biblical Demonology, took the position that no Christian could ever be controlled by demons. Evidently in response to reactions from Christian workers around the world, Mr. Unger has revised his position in a more recent book entitled Demons in the World Today.
The late V. Raymond Edman, once Chancellor of Wheaton College, firmly believed that Christians could be controlled by demons, though not to the same degree as the unconverted. Citing the tripartite view of man, Edman believed that demonic influence could be exerted in the bodily and soulish areas of Christians. He inclined to believe that the spirit of the Christian remained invulnerable to demons. Personally, I favor his view. And in numerous experiences with exorcism over the years, I recall only one case where an unconverted person was involved. All other cases were Christians in trouble.
Scripture, of course, is the final court of appeal. It is significant to me that Paul spoke of the possibility of receiving "another spirit" (2 Cor. 11:4). Though the Corinthians had not received such a spirit, this comment was made to a church which dealt with demonic disease (Matt. 4:24), and there is no suggestion anywhere in the Bible that there are some diseases Christians cannot get.
Christian believers do not need to go around ducking demons and cowering with fear. But they need to be careful. If Satan is given ground, he takes it. And he does so regardless of the theological niceties.