I think it DOES exist here, but is not recognized for what it is. I think often the supernatural is more openly active where it is more actively recognized. There are likely more overt examples of demonic worship in many of these countries as well — masquerading as native worship or the traditional faith of the country. Worship of demons definitely gets their attention.
But ... I was encouraged by the story. The main clue to me that this was describing actual events is that the pastor followed the guidelines in the epistles for dealing with satan.
It wasn't the usual "power of God at the hand of man" story about how some exorcist cast it out in the name of Jesus and then finished his coffee.
The pastor actually followed the guidelines given in the epistles via Eph. 6:10-18, 1 Peter 5:6-11, James 4:6-10.
I am more likely to believe these occurances if they are Biblical.