At the end of his excellent book, The Nature of Contingency: Quantum Physics as Modal Realism, Alastair Wilson offers a game-changing undercutting defeater for fine-tuning arguments for theism. It's a real advance in the literature, as it offers a persuasive reply to Roger White's celebrated "this universe" objection. The basic idea is that Everettian quantum mechanics implies the existence of a multiverse, and if you (rightly, in my view) accept the Everettian interpretation of quantum mechanics as abductively best, and if you antecedently come to the data of fine-tuning with a low credence in theism, then you thereby have good reason to think the diversity of universes to be of the right sort to explain the fine-tuning of our universe. Highly recommended.
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