The Free Will Defense
If God is all-powerful and all-good, why does evil exist at all?
How to use this guide
This guide is built for a 45-60 minute small-group conversation about "The Free Will Defense." Open with prayer, read the framing aloud, and use the questions below to surface what people actually think before you walk through the case. Aim for honest engagement over consensus.
Facilitator tips
- Read the lesson before the meeting; you do not need to be an expert, just a guide.
- Resist the urge to fill silence. The best discussions follow long pauses.
- When someone raises an objection you cannot answer, write it down and follow up next week.
- Close with a single takeaway from each member, not a doctrinal summary.
What we're studying
The problem of evil is the most emotionally and intellectually weighty objection to theism. Alvin Plantinga's Free Will Defense is widely credited with ending the logical problem of evil as a live threat: it showed that God and evil are not logically incompatible. The evidential version remains, but the conversation has fundamentally shifted.
The case in brief
Plantinga: even an omnipotent God cannot do what is logically impossible. Genuinely free creatures who can choose good must be able to choose evil. A world with free moral agents (and therefore real love and real moral value) requires the possibility of evil. God's creating such creatures is consistent with his goodness if the goods of freedom outweigh the costs of possible evil. This is a DEFENSE (showing compatibility) rather than a THEODICY (explaining why actual evils occur). Philosophers now broadly grant that the logical problem of evil fails; the live question is the evidential problem (do particular evils make theism improbable?).
Argument structure
Conclusion: The existence of evil is logically compatible with the existence of an omnipotent, omnibenevolent God.
- Genuinely free creatures who can love must be able to choose evil.
- A world with free moral agents has goods (genuine love, moral responsibility) unavailable in a world without them.
- God could have good reason to create free agents knowing some will choose evil.
What if someone says...
"Popular atheism still deploys the logical problem."
The professional philosophical consensus is that the logical problem fails. Popular atheism is typically a lagging indicator.
"Skeptical theism is convenient special pleading."
Skeptical theism applies a general epistemological principle: we often cannot see the reasons for another's actions, even human ones. Applied to an infinite mind, it is modest rather than ad hoc.
Discussion questions
- Does free will require the possibility of evil?
- How should we weigh the goods of freedom against its costs?
- What is the difference between a defense and a theodicy — and why does it matter?
- [Small group] Where in your own life does this question feel most pressing?
- [Small group] Who do you know that wrestles with this — and how could you talk with them about it this week?
Going deeper
- God, Freedom, and EvilAlvin Plantinga · 1974 · Problem of evil
- The Problem of PainC.S. Lewis · 1940 · Problem of evil
- Reasonable FaithWilliam Lane Craig · 2008 (3rd ed.) · Natural theology