[quote=@VitaVitaAR]
[@Yuri], [@NRVNQSR]: Well, the Church... actually uses a lot of the principles of magecraft.

For example, Black Keys are formed purely by passing prana though the hilts to produce the blades. Sacraments are outright a type of magecraft. While no, I don't think they're the biggest fans of it, this fact and the fact they've allied with magi and even consented to the instruction of some of their members in magecraft means they're at least willing to tolerate it if it furthers their goals.

[@GummyCat]: Yes, you can.
[/quote]

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.