Although this is not a problem that I've seen with GC Atheists, neither on this thread nor historically, many ideological tendencies there are in real life are de facto religions. They have their own versions of dogma, of priesthood, of sin, of salvation, of human nature and the interpretation of human history (with all of Creation, Eden Age, Fall, Prophecy, Revelation, Tribulation, Judgment Day, and Final Golden Age), of preaching, of converting, of what to do with the unbelievers, of what to do with civilian authorities, and so forth.
* Socialism. All of socialism, but most of all Marxism.
* Psychology and psychiatry.
* Vegetarianism and veganism.
* LGBT ideology.
* Some (not all) strands of organized racism: Zionism, White Supremacy, Black Supremacy, Raza movement.
These are all religions. These are the religions I don't approve of. It is outright dangerous that they are not recognized as religions, at that, and that they are given legitimacy as secular ideas, when they are not.