If any of this is substantially wrong I will be surprised, maybe even pleasantly.

It's not, if only because we never find out anything about their respective afterlives at all, other than the Sacred Groves, and that's not really an afterlife.

Okay, so the Axe-Wielders are not priests. Either that or Douglass has 'taken holy orders' confused with 'made vows', in which case I'm going to laugh at her.

I guess they're meant to be more like the Knights Templar or something?