The Best Argument Against God

Graham Oppy's "The Best Argument Against God" presents a sophisticated atheistic position grounded in theoretical parsimony and methodological naturalism. The monograph advances what Oppy considers the most compelling case against theistic belief: that naturalistic worldviews provide simpler, more economical explanations of reality than their theistic counterparts, while accounting for all available evidence equally well.

Central to Oppy's approach is his deployment of inference to the best explanation as a decision procedure between competing worldviews. He argues that when naturalistic and theistic theories possess equal explanatory power regarding observable phenomena, rational belief formation should favor the theory with fewer ontological commitments. Since naturalistic frameworks require only the natural world while theistic frameworks posit both the natural world and additional supernatural entities, naturalism emerges as the superior option by virtue of its theoretical economy.

The work engages critically with burden of proof arguments, contending that theists bear the evidential burden for introducing additional metaphysical commitments beyond those required by naturalistic explanation. Oppy maintains that absent compelling evidence favoring theistic over naturalistic accounts, the default rational position remains atheistic. This represents a significant departure from arguments attempting to demonstrate logical contradictions within theism itself, focusing instead on comparative theoretical virtues.

Methodologically, Oppy employs the tools of contemporary analytic philosophy, emphasizing conceptual clarity, logical rigor, and careful argumentation. His treatment reflects deep engagement with the philosophical literature on divine attributes, religious epistemology, and metaphysical explanation. The monograph systematically examines various theistic arguments—cosmological, teleological, moral, and experiential—demonstrating how each fails to provide evidence that uniquely favors theism over naturalism.

The significance of Oppy's contribution lies in shifting atheistic argumentation from negative critique to positive theory comparison. Rather than merely attacking theistic coherence or highlighting evidential problems, he constructs a comprehensive framework for adjudicating between worldviews. This approach acknowledges theism as internally coherent while maintaining its rational inferiority to naturalistic alternatives.

Within contemporary philosophy of religion, the work stands as a paradigmatic example of methodological atheism, demonstrating how naturalistic assumptions combined with standard epistemic principles yield atheistic conclusions. Oppy's argument has provoked substantial response from theistic philosophers, particularly those defending the explanatory superiority of theism or challenging his criteria for theory selection.