Lunar Cult

The term "Lunar Cult" is a pejorative referring to small groups of zealous believers who swear that they will obey the commands of a Lunar God. Lunar Cults are instruments of the Lunar Pantheon's will, used as reliable tools to enact quick change.
Arguably, some religions are Lunar Cults on a very large scale. Halikvar, Ishkibism , Nedira, Navana, The Great Daraka, The Singing Church of Orisha, Metena, Keveket, the Temple of Ishket, Areto, and Pratasam all have some level of intense reverence for one Lunar God over the others. As large international religions, they also tend to be rather bulky and internally diverse, though - not quite the intimate and small groups of secretive followers that "Lunar Cult" implies. It also helps that any religion large enough tends to shed those kinds of pejoratives.
Hiku Matsune is particularly well-known for founding Lunar Cults that she embeds throughout the world in secret. The practice is done by virtually all Lunar Gods to some extent, though, except for Agamine the Lost.