:D Karl would be delighted by that! Obviously even more if she expresses interest in converting but really any sort of earnest religious discussion is right up his alley.

Canonically he is great friends with several varieties of pagan (one of whom he has sworn serious-business fealty to and all that that implies) and spent several fondly-remembered months at a Buddhist monastery, so even if the faith she ends up finding isn't his he would still be supportive, if internally a little disappointed.