Unfortunately it doesn't work out like that. Listen to this edition of BBC Radio 4's Beyond Belief, in which Ernie Rae talks to two people who believe in witchcraft (and, incidentally, one who doesn't).
Here's the blurb from the BBC website:
Asking "...are the churches concerned doing enough?" is a bit pointless. The churches concerned are peopled by those who believe witchcraft is real, otherwise this problem wouldn't exist. The other churches — the ones that are not concerned — are just that: not concerned.
Children are being abused and in some cases killed because of irrational, unsupported beliefs. This is one of those instances when it isn't enough to point out the illegality of actions derived from wrong-headed beliefs. The beliefs themselves need to be called out, and those religionists citing them as justification for abuse should be hauled before the courts.