
In cases of real demon possession, a person cannot be saved until you first cast out the demons. The New Testament will help you determine and discern biblically whether it is an authentic demon or not. If you do exercise the discernment of spirits, it will always be with the Bible as your guideline.
Demon possession is accompanied by irrational behavior. People throwing themselves into the fire, gashing themselves, living in tombs, displaying superhuman strength or superhuman intelligence, counterfeiting the gifts of the spirit. Signs and wonders can be displayed by demons. Another sign is the presence of a physical malady without any pathology for it (i.e., a physical ailment with no medical reason for it).
Read Dr. Kurt Koch. Read good books on the subject. In cases of demon possession, the person's spirit is inhabited by an evil spirit. The Holy Spirit cannot enter them until the demon is cast out. You cannot set a demon possessed person free merely by witnessing to them.
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Scripture taken from the New American Standard Bible Copyright © 1960, 1962, 1963, 1968, 1971, 1972, 1973, 1975, 1977, 1995 by The Lockman Foundation.