I don't know why Elaine didn't just answer the question by telling Anna, and the whole audience, that since she's a researcher and has never even had the chance to try to study the purification, she can't pretend to know what it is, whether it's a special attribute magic or something entirely else. Because that's what a genuine researcher would say, especially in a public situation like that. This is, of course, why politicians or laymen sometimes dislike scientists, because scientists can't give clear answers to issues that haven't been studied sufficienly or contain other uncertainties.
I'm a bit confused as to why the Saintess magic being considered 'special magic' is an incompatible thing with their church's beliefs?... yeah IT IS special magic, so special in fact it was gifted by god; BOOM! DONE! It's hardly something that would destroy or even shake an entire church's belief system.
It reminds me of how many believe that the catholic church, which funded Darwin's studies, reacted poorly to his findings - despite accepting them very quickly; it was certain religious sub-sects that believe the bible has no allegories or metaphors, and is the 100% truth, that had trouble with his findings. Such beliefs are most common in America.
Anyway, my point is that religions are often more flexible than people realise.
Because the religion's official stance is that the purification is not magic in the same sense as all other magic. It's a divine miracle. Magic in that fantasy world is a matter of research, studies, development, and training, even engineering. The purification is supposed to be a power the heavens grant to a specific person, the saintess, so that the saintess uses it for the holy task of purifying corruption, including monsters. It's also because of this that the saintess has as much power of the head of that country. If they admit purification is just one special attribute magic among others, it's not a miracle anymore and there's no way the saintess should be equal to the leader of the whole country. There's also absolutely no reason why there should only be a single saintess if it's not a divine miracle bestowed on the most worthy individual. So, if there were more saintesses, how would you then define their political power? It's not like they could all be as important as a the pope (who is basically the king of the theocracy).