Atheism
Atheism is not the same as agnosticism: agnostics say that there is no way to know whether gods exist or not. Being an agnostic does not have to mean a person rejects or believes in god. Some agnostics are theists, believing in god. The theologian Kierkegaard is an example. Other agnostics are atheists. Gnosticism refers to a claim of knowledge. A gnostic has sufficient knowledge to make a claim. Adding an a, meaning "without", before the word gnostic results in agnostic, or literally, "without knowledge".