I wonder if narcissistic parents are drawn to ultra-strict religiosity as another way to control their children. Most followers of very strict religions don’t apply those rules to themselves nearly as much as they use them to threaten and control others. It’s like a narcissist’s wet dream: if you don’t do as they say (because “god” made them the “head” of the family) then “god” will punish you eternally. It’s so convenient!