Why do you believe in your Abrahamic god and not, say, Odin, Zeus or Osiris? What makes your myth more believable than theirs? (I'm not trying to mock you here, it's a serious question)
I think you're misrepresenting atheism. I'm yet to hear someone say "I believe there is no God" in a serious context, what is usually said is "I don't believe in God", or "I'm not religious". Very different statements & like with the unicorn analogy, I'm not going to position myself on the fence & bother postulating that perhaps there *are* invisible pink unicorns at the bottom of my garden, I'll just assume there aren't until proven otherwise - ergo, I define myself as an atheist.
I also feel it worth pointing out that the god(s) most people believe in *can* be (dis)proven. The only infallible god, is one that has never interfered with the universe - that includes creating worlds, burning bushes, producing offspring with supernatural abilities, the lot.