Atheism versus Theism

Alright, I want a good, clean fight.  Simply state your side, your argument/counter-argument/comment and whatnot.  I'm not trying to troll this, just wanting a good debate, so let's have one. (Atheist by the way)

(a) There's evidence for the existence of a being that we refer to as "God", but nothing aboslutely conclusive.  Just really, really strong
Show it or GTFO.

(b) There's no definitive argument or evidence against his existence, either.
Burden of proof, nigger. There's no definitive argument or evidence against the existence of unicorns either.