I’m not sure how to feel about religious parents who deny health care to their children.
If we ignore for a minute the suffering of these children, the majority of whom have treatable illnesses with good prognoses, we see that these actions are bad for the survival of the meme. Fewer surviving children => fewer people who can be indoctrinated => fewer people to spread the faith healing religion.
Maybe it would cause less suffering overall to ignore them and let time take its course? How many people do you suppose will have to lose a young family member before no one practices the religion anymore?
I briefly considered the possibility that they may be gaining some evolutionary advantage by refusing medical care. Now I’m not so sure, since many of the deaths I’ve read about were caused by one-offs (e.g., tumors) rather than strongly heritable diseases.