How we think about God matters, and the kindergarten mindset of the "Big Dude In The Sky" with thunderbolts and a scowl just doesn't cut the mustard. Here's a short article by Michael Dowd that attacks the fallacy at the heart of the problem.
For what it's worth, I believe the question "do you believe in God" is meaningless unless the term "God" is clearly defined. The Sky Father is a projection, not a reality - a human idol and nothing else. It's no tragedy to see it disappear like the smile on the Cheshire Cat, passing the way of Zeus and Odin. Is that atheism? No, it's a commitment to end idolatry. Put another way, many of the folk who call themselves atheists have a much clearer vision of the pervasive idolatry that parades under the cloak of Christianity than the rest of us.
Have a look at the article, and see if you agree. There's a lot more available here.