If one has been a born again believer for at least 3 years... one should be an expert concerning the spiritual realm. Just look at how prominent deliverance from demonic oppression & possession is throughout the Gospels and the book of Acts.
I'd like to recommend a POWERFUL book:
http://www.amazon.com/Demons-And-Del.../dp/0883682168
It's sad... people call "shamans" and "psychics" and "sensitives" and "paranormal investigators" to investigate spiritual events in their homes and to aid in getting rid of them. But if they talk to most "Christians" about dealing with such things one is met with obvious skepticism and even mockings on some occasions.
We are the one's called upon to deal with "hauntings", "oppressive forces", and "possessions".
Mark 16:17-18
English Standard Version (ESV)
17 And these signs will accompany those who believe: in my name they will cast out demons; they will speak in new tongues; 18 they will pick up serpents with their hands; and if they drink any deadly poison, it will not hurt them; they will lay their hands on the sick, and they will recover.”
Authority over spirits.
Baptism of the Holy Ghost.
Divine protection.
Gifts of healing.
Those are signs that should follow the true believer. Why do we not take it more seriously?