This is a good thriller with a suspense. Even though this is a horror movie, there is nothing horror in this. The possession, exorcisms etc are all common and repetitive in many Hollywood and Bollywood movies post The Exorcist.
One correction.. In the movie, Paul says that they are Pentecostal Christians. The Pastor carries a Rosary while performing exorcism. But, Pentecostal Christians do not carry Rosaries - which is normally associated with Catholics.
Watch this for some good thrills and good acting.