[quote=@NRVNQSR]
<Snipped quote by VitaVitaAR>

Well that's the magical foundation of the Church/Sacraments. It's independent from the magical systems utilized by mages. Mysteries created without the system of god are heretical to the Church for the most part. Kirei and Ciel are oddballs here I believe.
[/quote]

Still need to be able to do potentially do magic to use the Black Keys. Bit of an awkward bit, there: hate magic (or at least the association); need it to deal with anything. :P