At the first line I wanted to say, "no, I still think I hold my possition." But you make a good point with the Sister of Mercy -- the the case where a well-learned person gives a reasonable argument, I agree -- you can't simply dismiss them. However, being that there is a set system of beliefs and morals associated with Catholicism, and thus a single this which ismply Is Catholicism, even in this case it would just be a matter of intelligent discussion and debate to decide whether she was or was not Catholic.

That is, unlike with Democracy, there isn't really a "Catholicism as one understands it," but a generally cut-and-dry Catholic or Not-Catholic. That being said, it would probably be really interesting to have a discussion with her on the topic.

But, yeah, I'll concede you the point that there is a distinction to be made, but it's irrelevant in this case, I think.