That's the lip service.Ehhh the White God is clearly not just a catholic thing nor are all the tenants of Catholicism true in this universe or anything. Even the way God or angels appear can change based off on how people see them even if their underlying nature doesn't according to Butcher.
Butcher says that, but his entire story from start to finish never shows anyone else at the white God's level or that entity acting under a different name.
Cause that's how it works in the DF, two people with very different cultural backgrounds in the room with Uriel under his Uriel guise see the same thing reality under the same name, but if he was using a different name he could appear a different person in the Odin/Kringle style.
You can say it's a limit of perspective, but the story is only explored from the eyes the readers view from. Telling me that the god of the Bible, the august personage of jade, and Buddha are all the same guy in the DF for whatever reason is great, but if the only mask with globe trotting servants that do anything for even the most world threatening plots is Catholic God the the silence in your plot speaks louder than the whisper in your exposition.
Not saying it's better this way, but Butcher's design choices are pretty clear. Even European folklore is more important than major non-Abrahamic faiths for most aspects of canon.
Sometimes, but the point remains that you can't reliably buy weather services from the fey as a scrub. Fertility for a field maybe, but old McDonald can't trade cows for spring rains anymore.Also less relevant but figures like Mab and Leanensidhe have actually canonically interacted with relatively unimportant people throughout history. Like painters, composers, or just random people they come across. The latter interacted with bards, poets, and painters who sook her out for inspiration often ended bad for them of course. Given its not something they do regularly of course just you know across the centuries and such.