This is "just a rant" and he's just a jerk. I hope you directed this same rant his way. He needs to know how he makes you feel, also the kids.
The sad reality is that the cult will always come first if he's in it. I know what it's like to be that kid as a child and an adult. I'd try to take my dad fishing but we could never go in the morning because he had to go in service every Saturday without fail and then he'd have an elders meeting or something after. We pretty much always fished in the heat of the day but that's all that was left. You always get whatever leftovers there are after the cult comes first.