How about pastor? Or sister for a nun? Father for a priest should be capped I think.
I asked AI Chat about nun or Nun, and it has 6 comments, the last two were interesting:
1. Cultural Variations: Different cultures or languages may have varying rules regarding capitalization.
2. Consistency: Always maintain consistency in your writing regarding capitalization rules.
So, make sure you know what the language and cultural rules are and be consistent. That's tough. Do Canadians, Brits, and Aussies have different rules for caps than Americans? :-)