an Atheist is one who believes there is no higher being, a theist is one who believes in a higher being.  If you're undecided then you're agnostic.
		
		
	 
I get so sick of explaining this. Oh well... once more, into the breech...
The dichotomies between theism/atheism and gnosticism/agnosticism are orthogonal, but they are dichotomies. Agnosticism isn't some kind of "middle ground" "between" theism and atheism. The theism/atheism dichotomy describes a person's position of belief with resepect to the proposition "God exists." The gnosticism/agnosticism describes a person's confidence or beliefs about his justification for his partiuclar stance within the theism/atheism dichotomy. There are agnostic theists, as well as there are agnostic atheists. There are yet gnostic theists, and even still gnostic atheists.
The problem here is that you, like many armchair philosophers, have fallen under the misconception that theism = belief in god, atheism = belief in no-god, and agnosticism = not sure either way. Such an arrangement is nice and tidy, it would seem, but it simply isn't consistent with the meanings of the terms involved, nor is it as descriptive. 
The fact of the matter is that you either believe a god exists or you don't, and you can either believe that position to be rationally justified or not. Atheism proper is merely "not-theism," meaning anyone that does not believe in a god is an atheist whether they describe themselves thus or not. I, myself, am an agnostic atheist. I do not beleive a god exists, but I do not purport to know that no gods exist.
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1) Your post comes off as you being an arrogant ass... are you a philosopher yourself? if not than you are nothing more than an armchair philosopher yourself... as are 99% of the people in this thread.  So why don't we start by dropping the stupid BS arrogance it just makes you look stupid.  I took a few philosophy classes in college too, as did most people so stop acting like you're unique in some way. 
2) I don't give a rats ass how smart you think you are... here are the definitions of an atheist, a theist and an agnostic.  
If you are an atheist then you believe there is no god... you cannot simultaneously be an agnostic, and an atheist.  It's just not possible.  If you are an atheist than you believe there is no god.  Not a whole lot of unknowns or indecision in the concept of "no god".  Being an agnostic isn't about how confident you are in your beliefs in god, it's the state of not knowing one way or the other.  You are in actuality an Atheist who has no proof... which is exactly the same as everyone else... EVERYONE is either a theist with no proof or an atheist with no proof.  By your definition, EVERYONE is an agnostic.   
Webster says
Main Entry: 1ag·nos·tic 
Pronunciation: ag-'näs-tik, &g-
Function: noun
Etymology: Greek agnOstos unknown, unknowable, from a- + gnOstos known, from gignOskein to know -- more at KNOW
: a person who holds the view that any ultimate reality (as God) is unknown and prob. unknowable; broadly : one who is not committed to believing in either the existence or the nonexistence of God or a god
- ag·nos·ti·cism  /-t&-"si-z&m/ noun 
Main Entry: athe·ist 
Pronunciation: 'A-thE-ist
Function: noun
: one who believes that there is no deity
- athe·is·tic  /"A-thE-'is-tik/ or athe·is·ti·cal  /"A-thE-'is-ti-k&l/ adjective
- athe·is·ti·cal·ly  /-ti-k(&-)lE/ adverb 
Main Entry: the·ism 
Pronunciation: 'thE-"i-z&m
Function: noun
: belief in the existence of a god or gods; - the·ist  /-ist/ noun or adjective
- the·is·tic  /thE-'is-tik/ also the·is·ti·cal  /-ti-k&l/ adjective
- the·is·ti·cal·ly  /-ti-k(&-)lE/ adverb