I have a nephew who is 14. He has been told by other Christians that he has a demon in him. My question is can he have a demon in him as he declares he knows Jesus as his savior? I have searched the scriptures and cannot locate my answer.
According to Christian theology, if a person is truly a Christian, then the Holy Spirit dwells within them and Christ is the Lord of their life. If this is the case, there is no room for demons. The powers of darkness can pester or bother Christians, but not dwell in them. Demonic possession is a form of lordship over the human soul, and there is no room for two lords in one soul. Thus if you are in Christ and Christ is in you, there can be no demonic possession, for greater is He who is in us than any of those dark powers.
—Ben Witherington III