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Agnostic/Gnostic deals with knowledge
Atheist/Theist deals with belief
When Making A Case
The original person to coin the term agnostic - a scientist by the name of Thomas Henry Huxley (also known as "Darwin's Bulldog", for his advocacy of Charles Darwin's theory of evolution) - defined it with:
"Agnosticism is not a creed but a method, the essence of which lies in the vigorous application of a single principle... Positively the principle may be expressed as in matters of intellect, do not pretend conclusions are certain that are not demonstrated or demonstrable."
There seems to be a few active intended meanings of agnosticism in circulation. If you're unfamiliar with them, read up on it here and help avoid miscommunications - http://bit.ly/OvoTfc