At the current pace of translations, thats still like a year away, at end of volume 3.
Oh, and no, the bird(?)girl
isn't a nun/sister, she's just a regular village girl that knows some herbology and potion making.
Aside for the mention when the nun shows up, the rest of what I posted that got spoilered by the mod wasn't even a spoiler.
We literally see her class/job occupation: Doctor, and race: Kukuru, at Chapter 2.
Meanwhile the light resistance requirements is sex with clergy/nun(human).