A mixture of fundie christianity and traditional beliefs in Nigeria. The Niger delta has more churches than anywhere else in the world.
I was going to quote some paragraphs but it is all relevant and all horrific. Easier if you follow the link and read the story.
This was a money quote though:
"putting a traditional religion together with Christian religion - and it makes nonsense out of it"
No I'll think you'll find it was a nonsense already.
The documentary Dispatches Special: Saving Africa's Witch Children will be shown on Channel 4 (UK television channel)on Wednesday, 12 November, at 9pm (GMT)
Hopefully it will be accessible afterwards on their wensite channel4.com