The existence of God must be decided by the individual. The individual's perception and beliefs alone will determine whether or not they believe in a supernatural being which is greater than that which can be concieved. Really, if there's this almighty God, how can you prove that he isn't possible? Nothing is impossible, it's just a matter of relative possibility. This "God", being theorhetically omnipotent and omniscient, who's to say what it actually is?
My point is that a God is possible, due to its nature. I'm not saying that there is proof of a God, I'm saying that it's possible. I'm Agnostic myself. People didn't think that super computers were possible, yet it happened. The way the universe works, the way that everything is pieced together in such harmony, and that humanity itself is still continuing to advance, gives rise to the possibility that there is more at work than unguided Chaos.
God can also be used to describe the unknowns which science has as of yet not discovered and taken into account.
How do biological molecules fit so intricately and perfectly together? How does DNA, the source code of all carbon-based organisms work so beautifully? How did life even begin in the first place?
Unanswered questions, which have not yet been explained. No doubt, science will one day come up with an answer. But what will these answers reveal?
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Lalalalai.... I'll cut you up!