Julian Sanchez defends atheism in a hard to excerpt post on metaphysics. He's arguing against Ron Rosenbaum's plea for a "New Agnosticism." Here's Ron's central dilemma:

Faced with the fundamental question: "Why is there something rather than nothing?" atheists have faith that science will tell us eventually. Most seem never to consider that it may well be a philosophic, logical impossibility for something to create itself from nothing. But the question presents a fundamental mystery that has bedeviled (so to speak) philosophers and theologians from Aristotle to Aquinas. Recently scientists have tried to answer it with theories of "multiverses" and "vacuums filled with quantum potentialities," none of which strikes me as persuasive.

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