A return to the dark ages.

[Philippus Flavius Homovallumus]

There have been christian sects doing this for decades. The alarmist title is a bit extreme.

Stupid, and very bad for the child. But it is their religion, let them do as they please.

I dissagree. Vaccination is not just about the individual but also about the general population. If enough individuals opt out you reach critical mass and then next thing you have an epidemic and all those babies too young to be vaccinated die.