Why do cults hate queers? I would think you could just write us in as like... Subservient to the family as extra resources or something.

It's probably the afterlife thing. You need people to make babies so that people are afraid and cope properly by relying on your cult. Can't reinforce your cult with people who aren't going to recruit the strongest members: brainwashed from birth.

That, and the existence of gays asks a lot of questions about existence that VERY MUCH destroy the logic of what the cults need to survive.