Atheism is characterized by an absence of belief in the existence of gods. This absence of belief generally comes about either through deliberate choice, or from an inherent inability to believe religious teachings which seem literally incredible. It is not a lack of belief born out of simple ignorance of religious teachings.
The term ‘agnosticism’ was coined by Professor T.H. Huxley at a meeting of the Metaphysical Society in 1876. He defined an “agnostic” as someone who disclaimed both (“strong”) atheism and theism, and who believed that the question of whether a higher power existed was unsolved and insoluble. Another way of putting it is that an agnostic is someone who believes that we do not know for sure whether God exists. Some agnostics believe that we can never know.
>http://www.infidels.org/library/modern/mathew/intro.html
>http://christthetao.homestead.com/articles/social-construct.pdf
>http://books.google.com/books?id=30BlJkVZBQgC&pg=PA91&lpg=PA91&dq=%22notion+of+god+appeared%22&source=bl&ots=oy7BSsjto4&sig=_JybwZkWqQQOiF9DH1rFniO009Y&hl=en&ei=dIyNTqfoEeLb0QHA1IBI&sa=X&oi=book_result&ct=result&resnum=1&ved=0CB0Q6AEwAA#v=onepage&q=%22notion%20of%20god%20appeared%22&f=false
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>http://donjohnny.hubpages.com/hub/god_debate