Theists: What is the most compelling argument you have heard for Atheism?

[masterofpuppets]

Except that "compelling arguments for atheism" is a nonsensical phrase, because atheism is the rejection of theistic claims that have not met their burden of proof.

In that sense, there is only one argument that needs to be made for atheism: theism sucks.

Atheism can also be positive, belief that there is no God, so saying there are atheist arguments is not necessarily nonsensical. Also, you can argue for why it is more rational to have an absence of a belief in any deity, constituting an argument for atheism.

Right, but at the most basic level, atheism simply means no belief in the claim "a god exists". An atheist could believe the claim "no gods exists", but that is a different claim. Atheism and theism address belief/non-belief in one claim only (of course, no one can believe in both claims, as they are contradictory).

My point is that there are claims, and there are beliefs about claims. One either believes or doesn't believe a claim (the latter being a direct logical negation). Theism is the former and atheism is the latter where the claim is "god exists". So in that sense, you can't really make arguments for atheism, because atheism makes no claims. You just need to show that theistic arguments fail.