[Need can confidently say, as someone outside of the Houses system: the whole concept sounds Bad. Probably not something she can fix right now or possibly ever, which is fine. Plenty of terrible things she can't fix.]

Does swearing by things have any particular meaning to you?

[She shakes her head.] Wizards are fine. I'm a mage, if you've forgotten. I suppose I'd call your people, what? Zealots?

[She can line up a whole spiel about how the different words for mage all used to mean different things and a witch isn't the same as a sorceress isn't the same as a wizard and it's a pain when people use them interchangeably. This isn't the time.]

I'm... hm, this language doesn't have the right term for it. I've been... a shaman? a priest? a nun? A lay sister, maybe. [There are some other words that have entirely too grandiose connotations and she's not going to say them.] But who and what people worship isn't anything like as important as what they do.