If one is an atheist, then one must logically have a case against the existence of God. It would not do merely to show that the arguments put forth FOR the existence of God are flawed. That would work for an agnostic but not an atheist. An atheist, by definition, would, I think, have to have some reason for not believing in God in addition to flaws he has noticed in arguments for the existence of God.
This is simply a category mistake.
A (without) theism (belief in God)
You're confusing atheist with antitheist.
As someone who (I'm assuming) doesn't believe in undetectable massless eternal swarms of pixies, do you really have a reason not to believe in such lovable creatures?