I know you believe that, but with all due respect, out in the real world, it just isn't so.
Beth’s was not an isolated case. In fact, how I learned to help demonized Christians was through a marvelous books about freedom from demonic influence by the internationally recognized conservative theologian, Dr. Neil T. Anderson of Biola University. His book, “The Bondage Breaker,” has led literally thousands of oppressed Christians to freedom in Christ. In “Bondage Breaker” (over a million copies sold) and his follow-up book, “Released From Bondage,” are dozens of account of demonized Christians led to freedom, including an almost identical case of demonic deception through the counterfeit gift of "tongues." In fact, it was by reading this account in “The Bondage Breaker” that I was able to advise Beth on how to deal with the evil spirit within Rachel.
Though paraphrased, the incident below is recorded in: Dr. Neil T. Anderson, The Bondage Breaker, (Eugene, OR, Harvest House, 1990) pp159-160.
After a lengthy discussion about false prophets and teachers, Robert admitted, "I think my problems began when I failed to test the 'gifts' of tongues and prophecy conferred on me by false teachers. Not only was I deceived, but I have deceived others myself."
"Would you be willing to put your gift of tongues to the test?" Anderson asked. He assured Robert that he was interested in putting the spirit to the test, not Robert. Wanting to be free of deception and right with God, Robert said "Yes."
Anderson instructed Robert to begin praying aloud in his "spiritual language." As he began to chant an unintelligible prayer, Anderson said, "In the name of Christ, and in obedience to God's Word, I command you, spirit, to identify yourself." Alvin stopped in the middle of his chanting and said, "I am he."
At this point a novice may have been tempted to take off his shoes, thinking he was on holy ground. But Anderson continued the test: "Are you the 'he' who was crucified under Pontius Pilate, buried, raised on the third day, and who now sits at the right hand of the Father?"
Robert almost shouted the response: "No! Not he!" Anderson led Robert through a prayer renouncing Satan's activity in his life, and he was freed from that spirit.