There is the Gorean religion that promotes female submission and encourages them to be sex slaves, and the Church of Euthanasia which has a commandment that one should not procreate or even kill oneself so as to reduce the population! Even their names are silly, let alone their foundations and beliefs.
The term “Gorean” comes from the Chronicles of Gor series of novels by John Norman, set mostly (where else?) on the planet Gor. The society in the novels is a patriarchy in which women are enslaved and bought and sold as property (there are some male slaves as well, though they’re rare). In fact, on the planet Gor, gravity itself seems to be sexist. Tarl Cabot, the Earth-born hero of the series, is described as having much greater strength on Gor, as his muscles developed to function under Earth’s higher gravity. However, Earth women have no such experience and find themselves physically helpless before Gorean men.
Many Goreans simply use Norman’s setting for the purposes of BDSM role-playing. However, vocal proponents of Gorean “philosophy” actually think the series is a good blueprint for society, which has led to the creation of Gorean sex cults. The Goreans justify the subjugation of women using a mixture of recycled eugenics (or dysgenics, to be more technically accurate) and Social Darwinism. In short, back when men were men and women were women, skull-cracking cavemen roamed the Earth who were better adapted for survival because of their superior combat skills and penchant for kidnapping women. This kept the riff-raff from reproducing until the advent of modernity, industrialization, and feminism.
A splinter group from the Goreans called the Kaotians, founded by Lee Thompson, was raided in May 2006. In 2008, Thompson was sentenced to three years in prison for forcing his girlfriend to have sex with a number of other men.