When I completed the last THM quest, I got a mixture of Buddhism and Catholicism. Catholicism from the structure of the guild and its rigidness but Buddhism on how everyone else is reliant on us for funeral rights. Much like Japan is not very religious many of them rely on Buddhist monks for funeral rights. We're also very vengeful, and we carry out rights of vengeance against people that had contracts with the guild but we won't do it against our own typically. So its a twisted world definitely, but in the THM guild world I get that they would see everything they do as right and holy. Astral/Umbral, we're the balance between light and dark, we're the grey area between good and bad.