in mannerisms it seems as though Catholicism does teach a lot of submissive tendencies. It would seem to me however, that enacting those learned behaviors in another venue would be going directly against some religious teachings. You're not to worship any human other than your God, correct? So wouldn't portraying your submission to a Dominant kind of be breaking that rule and therefore make you a "bad girl" in terms or religion whilst making you a "good girl" in the eyes of your Dom.
... just my first thoughts on the subject, not intended to make judgement or offend.