The Church of Euthanasia originated the well-known and well-put bumper sticker
"Save the Planet - Kill Yourself.
Their cause is human overpopulation and their teachings are embodied in their pillars, as explained on their website:
Even a major war or epidemic hardly dents the rate of growth, and modern wars have tremendous environmental consequences. It is for these practical reasons, as well as moral ones, that Euthanasians support only voluntary forms of population reduction, including suicide, free abortion, and sodomy, which they define as any sexual act not intended for procreation. They are also fiercely vegetarian, and support cannibalism for those who insist on eating flesh.
Their membership requirements are simple: "Membership implies a lifetime vow to not procreate
. Procreation is guaranteed excommunication
." Join today!
They also have cool stuff, like "Real men wear skirts!" stickers.