Humanity's greatest invention is religion, which does not mean necessarily mean belief in gods. Rather, religion is any system of norms and values that is founded on a belief in superhuman laws. Some religions, such as Islam, Christianity and Hinduism, believe that these superhuman laws were created by the gods. Other religions, such as Buddhism, Communism and Nazism believed that these superhuman laws are natural laws. Thus Buddhists believe in the natural laws of karma, Nazis argued that their ideology reflected the laws of natural selection, and Communists believe that they follow the natural laws of economics.