I agree, and have always found that scene, and the one where everyone is horrified at the prospect of an embarrassing discussion of religion, hilarious, with Laurie happily rattling on about religion in terms of it being 'hymns and things' and Zeus and co. When I first read AF in the Ireland of the 1970s, as someone from a society which was still thoroughly saturated in Catholicism, it was difficult for ten year old me to understand precisely how Laurie has failed to grasp, not only that other people are believers, but that she herself is supposed to at least pay lip service to belief, or at least get that it's being presented in those terms. (It is only now, as far as I can judge, that Irish Catholicism can be assumed to be as tepid and occasional an affair as Anglicanism is for many people here. My entire primary school education in a convent school was subordinated to preparation for first communion and confirmation, and the nuns left us under no illusions about the reality of judgement and hell and such matters.) Ann, however, is AF's only actively-believing Anglican - all other characters who are not hideously embarrassed by religion are Catholic - Madame Orly, Patrick - or, arguably, Jewish, if you grant that Miranda is at least cognisant of the tenets of Judaism, even if her family isn't observant. Everyone else is paying lipservice, and there is a well-mannered school assembly/going-through-the motions in AF's representation of Anglicanism that makes it seem quite plausible to me that someone as self-centred and vague Laurie never actually realised she was supposed to believe this stuff.