They seem to be linked to a ministry as evidenced by this quote in the Milwaukee Journal Sentinel:
There were also two postings under her name on the Web site AmericasLastDays.com, which is operated by Unleavened Bread Ministries, an evangelical ministry that focuses on the apocalypse.
Many people who refuse medical care for their childern are loosely affiliated with such groups. It's kind of like the fringe vegans who only give their kids almond flour and are surprised that they die. They usually have some type of belief system which may not be with a local church.
I don't care if parents want to not avail themselves of health care. It really bothers me when a child dies for a completely preventable reason.
ETA: in the MJS article, the mother said she'd do it again if circumstances were the same. And there are other children.
The following member says Thank You: