This is fucking sick.
The scary thing? These parents did this because they cared for their children and wanted them to grow up healthy – just like any other parent. Just like you. Just like me. The corrupting influence was that they had shitty, unsupported ideas about the nature of the universe.
The other scary thing? These people are just as likely to be right about the will of god as every other Christian you interact with.
Irrationality is dangerous. Fight it.