Reading the link in the OP, I guess it's even more scary for the people who are suffering with it, especially if the feel the drugs arn't helping.
If you find the voices in your head scary no amount of rationalising will help, because to people that hear them they are real, even though you tell them no one else is hearing them.
Unable to believe it originates in their own mind, they seek help from other sources when the drugs don't help.
The priests are only trying to help within their own belief system.
The problem I've found, is that a person who hears voices can't seem to rationalise that the voices arn't real, because they can hear them, like you hear things.
It's like you being told that what you are hearing seeing and feeling isn't real, it's upsetting And some cannot accept its not real.
It's cogantive dissonance, they hear it, it can't be their imagination therefore it must be an outside source.
Some might go to priests because if the drugs don't help, they feel the voices are real and the priest tells them they are right, and he can take them away.
Perhaps they find that better than thinking they are wrong and they are stuck with it.
It's sad really.