For centuries, atheologians pressed a bold claim: the existence of evil is logically incompatible with the existence of an omnipotent, omniscient, and wholly good God. The propositions could not both be true. If suffering exists, God cannot.

This logical argument, forcefully articulated by J.L. Mackie in 1955, dominated mid-twentieth century philosophy of religion. Yet by the 1970s, its confident deductive structure had been substantially dismantled, largely through the work of Alvin Plantinga and his free will defense.

The atheological project, however, did not collapse. It evolved. Contemporary critics now argue that while evil may not strictly contradict theism, it constitutes strong evidence against it. This shift from demonstrative to probabilistic reasoning represents one of the most significant methodological developments in modern philosophy of religion, and demands careful analytical scrutiny.

The logical problem of evil, in Mackie's canonical formulation, asserts an explicit contradiction between three propositions: God is omnipotent, God is wholly good, and evil exists. To generate the contradiction, Mackie required additional premises—that a good being always eliminates evil so far as it can, and that there are no limits to what an omnipotent being can do.

Plantinga's free will defense targeted precisely these auxiliary premises. He argued that it is possibly the case that even an omnipotent God could not create a world containing significant moral good without also permitting moral evil. If creatures are to be genuinely free, God cannot causally determine their choices while preserving that freedom.

Crucially, Plantinga's argument required only logical possibility, not plausibility. To defeat a claim of strict incompatibility, one need only exhibit a coherent scenario in which both propositions obtain. The concept of transworld depravity—the possibility that every creaturely essence God could actualize would go wrong in some circumstance—sufficed for this modest task.

The consensus that emerged, even among prominent atheist philosophers like William Rowe, was that the logical argument had failed. Theism and the existence of evil are not formally contradictory. This concession, however, opened the door to a more modest but potentially more devastating line of attack.

Takeaway

Logical possibility is a low bar to clear, but clearing it does not settle the question of whether a claim is reasonable. Defeating incompatibility is not the same as establishing plausibility.

William Rowe's 1979 formulation reframed the problem. He conceded that some evils might be logically necessary for greater goods, but argued that the sheer quantity and character of suffering we observe cannot plausibly be so justified. His famous example was a fawn burned in a forest fire, dying slowly over days in a remote wilderness—suffering apparently disconnected from any redemptive purpose.

The argument takes an inductive form. Premise one: there exist instances of intense suffering that an omnipotent, omniscient being could have prevented without thereby losing some greater good or permitting some equally bad or worse evil. Premise two: an omniscient, wholly good being would prevent any such suffering. Conclusion: no such being exists.

The evidential force lies in premise one. Rowe does not claim to prove that gratuitous evils exist; he claims we have strong inductive grounds for believing so. After careful reflection on countless instances of animal suffering, natural disasters, and human agony, we cannot identify any greater good served. The inference from no discernible justification to no justification is the argument's evidential engine.

This shift is philosophically consequential. Rowe's argument concedes what Plantinga demonstrated—that God and evil are compatible—while insisting that the specific evils we observe render theism improbable. The debate now concerns not logical relations but epistemic warrant, probability, and the reliability of our moral and axiological perception.

Takeaway

The move from 'impossible' to 'improbable' seems modest, but it changes the entire terrain of debate: we are no longer arguing about concepts but about what our experience of the world justifies us in believing.

The dominant theistic response to Rowe is skeptical theism, developed by Stephen Wykstra, William Alston, and Michael Bergmann. The strategy targets Rowe's inductive inference directly. From the fact that we cannot discern a justifying reason for some evil, it does not follow that no such reason exists. Given the vast cognitive gap between finite human minds and an omniscient God, our failure to perceive divine purposes is exactly what we should expect.

Wykstra formalized this through the Condition of Reasonable Epistemic Access: we are only entitled to move from 'it appears that p' to 'p' when we have reason to think that, if p were false, this would likely be apparent to us. Given divine transcendence, this condition is not met regarding God's reasons for permitting particular evils.

The response is powerful but incurs philosophical costs. If our moral and axiological perception is so unreliable regarding God's purposes, this skepticism threatens to spread. How can we trust our judgments that certain actions are morally required, when God might have unknown reasons rendering our ordinary duties inappropriate? Critics like Michael Almeida and Graham Oppy argue that skeptical theism undermines both moral knowledge and the very reasoning used in natural theology.

The dialectic thus reaches a philosophically substantive impasse. Theists must accept significant restrictions on our epistemic capacities in the moral domain, while atheologians must defend the reliability of our inductive judgments about goods and evils. The problem of evil has become, in essence, a debate about the scope and limits of human moral epistemology.

Takeaway

Every philosophical defense has a price. The question is not whether skeptical theism works, but whether we can afford what it asks us to concede about the reliability of our moral vision.

The transition from logical to evidential arguments represents genuine philosophical progress, not mere retreat. The debate has become more refined, focusing on the epistemic principles governing inference from experience to metaphysical conclusions.

Neither side has produced a decisive verdict. The evidential argument possesses real force, while skeptical theism offers a coherent, if costly, response. What emerges is a tension between competing epistemic virtues: intellectual humility about divine purposes versus confidence in our moral perception.

Perhaps this is the mark of a genuine philosophical problem—not that it admits of easy resolution, but that engaging with it seriously clarifies what we believe and why.