I respect the right for adults to do stupidity--and deal with the consequences, which could include final damnation for their souls. But, when you have children involved, these are too often the ones most deprived of everything normal. They can't go on class trips, they can't do anything that is even loosely associated with holidays, they never have fun during vacations (or any other time), they are always out 50 or 60 hours a month in field circus while such parents are pious-sneering, they get dragged to Israel when they decide to go there on a mission, they never get as much as an ice cream cone because of the money being thrown away, and so on.
If they need a set of strict rules, at least make them rules that go along with nature.