I came upon this post when searching for another one. I had forgotten some of these (this post was original presented in 2011), so it seemed worth a revisit...
Here are a few minority religious groups seen at least as bit odd (if not outright dangerous) by the majority of the City's citizens:
The Abattoir Cult: Secret followers of the sinister and bloody-handed Lord of the Cleaver. A liturgical text (anthropodermically bound) honoring this obscure eikone is known to exist in a private collection in New Lludd. His cult tends to crop up in districts devoted to meatpacking or slaughter pens and is associated with the emergence of serial killers.
The Temple of Father Eliah Exalted: This Old Time Religion sect preaches racial and gender equality, chastity--and the godhood of its prophet, Father Eliah Exalted. The Temple owns a number of groceries, gas stations, hotels, and other business. These are ostensibly held by acolytes but seem mainly to enrich the Father. The Temple is politically active and the Father’s support can sway elections. Many are suspicious that Exalted’s powers of oratory and occasional miracles suggest that he is one of the Gifted or perhaps a secret thaumaturgist, but proof has been hard to come by.
Serpent-spotters: An informal collection of people forgotten by society--mostly poor and elderly spinsters and widowers--who are convinced that the monster that appeared in the Eldritch River 30 years ago, and supposedly delivered secret prophecies to City fathers, will return, heralding the apocalypse. On days individually chosen they hold vigil in Eldside Park. They hope to be present at the time of the serpent’s return so it will reward their faith with a ride on his back to a watery Paradise.
The Electrovangelic Church of the Machine Messiah: A worldwide movement dedicated to building the perfect construct to manifest the Messiah and usher in a new age of mechanical spiritual perfection.
The Followers of the Rabbit: Not an organized religion, but instead a collection of superstitions and cautionary urban legends forming a secret liturgy for some folk working along the boardwalk of Lapin Isle. They hope to placate the godling of the island, the dark personification of the rabbit in the moon--the man in the rabbit suit that is not a man.
2 hours ago