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

[Mister Agenda]

Methodological naturalism isn't a presupposition, and that's the kind of naturalism you'll find around here. Just give us one unnatural thing, just one, that stands up to scrutiny; and we'll change our minds.

We did. You didn't.

I must have blinked. What was it?

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1. It seems you are unfamiliar with methodological naturalism--with is by definition a presupposition. It might be justified in the lab to employ methodological naturalism, it is a not justified in the social sciences (including history and psychology). By doing so, you are making a claim about the world that you cannot prove: namely, there is no supernatural. 

Methodological naturalism makes no truth claim. It is a method, a strategy, used in science for pragmatic reasons.