"Neglect" is one of those amorphous words that can be adjusted easily to expand government intrusion.Faith healing, while utterly futile apart from the placebo effect, is not the issue. The issue is parental neglect. See my example above. You can attempt all the faith healing you want, so long as you don't neglect the real medical needs of your child.
By what principle of morality?Letting your child bleed out, or undergo any other preventable process of death, is more immoral than having sex with him.