That is because the religionists made it up Little Hawk, just as a way to demonize us! Here is what it says at the website:

NONTHEIST

What Atheists & Agnostics Believe

Atheists do not believe in a god or deity. Atheists' beliefs are similar to those of the Secular Humanists but do not necessarily include the emphasis on humanity's ability to improve the human condition. Views on contemporary issues vary widely.

Agnostics are inclined to question the existence of supernatural being(s) or a force, e.g., the answer to whether or not God (or Deity) exists would be: "We do not and/or cannot know."