And this is where your insistence that atheism is the polar opposite of theism fails because, infact, it is the rejection of theism, a lack of belief, not the belief towards the opposite.
What you are basing your 'polar opposite' argument on would be Theism v Anti-Theism.
An opposite 'belief' would be a belief based on the same principles as those constructing the theist assertion when, as I keep having to point out to you, ...
Rejecting that a light bulb is off is by definition a proclamation that it is not on. Your conclusion is by definition at the exclusion of the opposing view point. You are now taking quite wide liberties with definitions of words and sentence structure of the English language, even contradicting your own statements. Your conclusion with complete lack of evidence is not substantiated. I understand your argument for burden of proof, but THAT EQUALLY APPLIES TO YOUR STANCE. Your premise is God does not exist. I argue you can not possibly have evidence for this. You claim you need no proof because it is self evident (sound like theists much?) As a person with no stake in either argument, I am quite comfortable pointing out your circular logic in this regard.
...atheism is the rejection of the theist assertion on the principle that it is baseless.
That is some quite impressive mental gymnastics you are doing there to justify your bias. Saying you reject something "on the principal that it is baseless" is not the same as actually stating an actual principal. If that is your standard of evidence we could sit here making conclusions ALL DAY about things we couldn't possibly have a clue about, and just chock up any doubts to being wrong because they are "baseless", even though there is no evidence one way or the other. Do aliens exist? Yes? No? How would we even begin to know? Making conclusions SOLELY on the lack of evidence is flawed and a fallacy.
An opposite 'belief' would be the belief that there was no God and that belief would have to be the sole factor in the assertion in order to make it the polar opposite of theist belief.
Rejecting an assertion on the basis it is poorly constructed is not the same as rejecting it on the grounds of opposing it.
I completely reject the first statement here because it is nothing but back flips with a complete lack of sense or logic. This is you again offering a false dichotomy stating what you wish a definition of words were, not what they actually are. You are confusing evidence for having a belief, with the ability to have a belief, as if you can not make a conclusion that is a belief unless belief alone is your only motivation. BTW, tell me, how does one reject an idea on the grounds of opposing it? That is not evidence, or even logic. That is basically you saying you reject it because you reject it.
Lack of evidence + conclusion = belief
Atheism BY DEFINITION is a belief.
ATHEISM:
Full Definition of ATHEIST
: one who
believes that there is no deity
http://www.merriam-webster.com/dictionary/atheistOrigin
late 16th century: from French athéisme, from Greek atheos, from a- 'without' + theos 'god'.