A set of beliefs concerning the cause, nature, and purpose of the universe, especially when considered as the creation of a superhuman agency or agencies, usually involving devotional and ritual observances, and often containing a moral code governing the conduct of human affairs.
http://dictionary.reference.com/browse/religion
No, I'm pretty sure I knew what I was talking about.
No one denies climate change, not even the deniers. The climate has been changing since the Earth was formed. Bill Nye is fighting a straw man. What the deniers dispute is humans having a majoritive effect on climate change. The science on that is not settled, especially when new papers are being published trying to explain a hiatus in the warming trend and the significance of the oceans in the atmospheric temperature. If the science on that was settled there would be no use for continued research.