It vaguely reminds me of the theology created by Scott Lynch in the Gentlemen Bastards fantasy books. There are twelve gods that specifically rule over different aspects of life, each with it's own church and servants... But there's an unspoken thirteenth god that supposedly looks out for thieves and con men.
Back when we started talking about the guilds, Burrell brought up The Lies of Locke Lamora
a lot - specifically relating to the Rogue being kind of like the Gentlemen Bastards, with their thievery being somehow honorable. I later read the books, and really really liked both the world and the story in The Lies of Locke Lamora
(but I thought the second book, Red Seas Under Red Skies,
was a mess). Anyway... The number of our gods and guilds being set to 12 was coincidentally the same as those books, and the number was chosen way before I ever read them. 12 is just a convenient number
I also independently came up with the idea of the 13th "Lost Guild" which was not chosen by the gods, and later realized it was similar to the "Unnamed 13th" god of the Gentlemen Bastards books. So yes — there are a lot of similarities, and hopefully the similarities are good ones. I will admit that the Gentlemen Bastards ideas have probably crept into our mythos to some degree, but I'm trying to not imitate the books, just for sake of not lifting material and remaining unique