I like this comment - I never thought about it like this before!
As long as it is used as well as conventional medicine I see no harm in it.
But if mumbojumbo (including silly remedies like homoeopathy, exorcism, sacrificing a pig etc) is used INSTEAD of conventional medicine then the person that caused this should be held responsible for the outcome based on the local legislation for child neglect / murder.
No. No. No. NO. No. HELL NO!
If you want to pray, that's fine and dandy, but for the love of Basement Cat, get the kid proper medical attention!