I dont think that Fanny's ideas on "non religious" people like Mary would necessarily be to pity them.. I think that she woudld be disapproving and feel that soemone like Mary who has no real religious sensibility is to be disapproved of, not pitied, and that she may well go to the bad ...

But I think that Mary IS the person who begins to push her buttons and make her "normally angry" at times. I've always found it a bit irritating that Fanny is so "'umble" with the Bertrams. I dont blame her for being shy or for not attacking Mrs Norris, obviosuly she can't do that but I do find it odd or annoying that she dare not begin even to criticise them to herself even in her private thoughts. She seems to "love" all of them, IIRC later when Maria marries she manages to convince herself that she misses her cousin who has barely been civil to her all her life...