Hey hey hey, I object to this "terrible horrible no-good very-bad Apostate" stuff! Signy is a pretty nice, mostly helpful, very short Apostate-Kind-Of!
Who also knows next-to-nothing about surface religions. (Probably 'hey so they had this Paragon named Andraste who got set on fire a long time ago and now they all worship her instead of making new Paragons. Weeeird.' Or, I don't know, some variation that somehow lets me use the made-of-awesome phrase 'jar full of burned woman'.) So, she will be very puzzled by the Templar-ness.