With respect, I think Leenia that you are incorrect, as both the first hand accounts of Eliza in this thread and the briefest of internet searches reveals:

"Because of the increasing hardship many children end up living with members of their extended family, and a phenomenon which experts say is unique to Congo is developing. Children are being accused of sorcery and chucked onto the streets.

The unlucky ones are murdered by their own family members before they escape. Which is why Ikomba and Luwuabisa are in such danger. For now, their parents are not completely certain of their diagnosis.

So they take them to a sect to find the real truth. It is there that the story starts to get really frightening.
Prophet Onokoko has drawn more than 200 children to his sect
The sect - run by a free-thinking Congolese Bible teacher called Prophet Onokoko - has 230 children on its books. All are accused of witchcraft.
Many have been thrown out of their family homes. All will have to undergo some kind of ritual exorcism to expunge the evil spirits."

That story from the Congo by the BBC is over a decade old. At the time of writing, it states that according to experts this particular phenomenon "is unique to the Congo". Now these beliefs about 'witch children' (or 'changelings' if you will) and 'exorcism' practices are becoming more common in the UK among African immigrant communities.

These children (as Eliza explained) are being used as scapegoats for social ills such as sickness or disease in poor African communities. While in the UK (as one story highlighted) such children so branded, might become the focus of an African immigrants paranoia about not being allowed to remain in the UK.