Kilgore Trout
Misanthropic Humanist
And then there is the more important argument: That of the responsibility to yourself. I worry that the use of the "burden of proof" argument convinces people that they do not have to have any reasons for their disbelief. You owe it to yourself (at least, if you want a rational worldview), to understand why you reject the arguments made in favor of god's existence. And this has nothing to do with convincing other people.
I'm certain that most atheists have sufficiently good reason to reject the claims put forth by theists. However, "burden of proof" is something specific, and if the atheist isn't making a claim they are trying to convince others of, then there is no burden of proof. I understand what it is that you're trying to argue. However, I think your point is getting watered-down and lost in your attaching it to the idea of a "burden of proof."