Well it is quite obvious that you can't prove or disprove any deity.
Personally I consider myself an atheist because it is my personal opinion / belief that there is no god. I know you can't prove it so I'd probably be considered an agnostic but I'm leaning towards the atheist side.
The reason why I'm so heavily in favour of atheism in these discussions is that knowing your faith is based on believing and not evidence is important to me. When someone says "I know I can't prove it. It's just my personal believe I know it could be different" then I have no problem accepting it. It's completely fine so why should I try to disprove a person who obviously gains something from it? It only cracks me up when people try to explain their believe with amazingly complicated theories and - as a side effect - throw everything else we know so far out of the window. I wouldn't call that faith anymore, it just stops you from accepting anything that contradicts your personal belief.
So to me it's not the question do you believe in god that counts, it's the way you believe in him (or her 
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