29-Week Study & Discussion Guide

Mere Christianity

by C.S. Lewis·176 discussion questions

Week 1 — FreeRead the Preface of Mere Christianity.

Discussion question your group will work through:

1.Lewis uses the image of a hallway leading into separate rooms to describe 'mere Christianity.' What is the hall, and what are the rooms? Why does he think it matters to get people into the hall before worrying about which room they enter?

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About This Study Guide

Mere Christianity began as a series of BBC radio talks delivered by C. S. Lewis during World War II, when the nation desperately needed a clear, confident articulation of the Christian faith. Lewis — a former atheist and Oxford don — was uniquely suited for the task. His goal was not to argue for any particular denomination, but to lay out the common hall of Christian belief that all major traditions share: the "mere Christianity" of his title. The book moves in four parts, from the universal moral law as evidence for God, to the nature of God and humanity's problem, to the person and work of Christ, and finally to the practical challenge of becoming the kind of person God designed you to be.

This study guide is designed to walk you through Mere Christianity week by week, one chapter at a time. Each week, read the assigned chapter (they are short — most take only 15–20 minutes), take a few minutes to journal your reactions, questions, and any points of resistance or delight, and then bring those reflections into conversation with your small group or a trusted friend. If you are working through the guide alone, allow extra time to sit with the discussion questions before moving on. The goal is not speed but transformation — Lewis himself said he was not trying to win arguments but to describe a way of life.

By the end of this guide, you will have built a coherent framework for understanding why Christianity makes sense, what it actually claims about God and humanity, and how its truths are meant to reshape you from the inside out. Whether you are a skeptic testing the faith, a new believer seeking foundations, or a longtime Christian whose belief has grown dusty, Lewis's argument has a way of making the familiar feel freshly astonishing. Come with honest questions. Lewis was not afraid of yours.

29-Week Schedule

  1. Week 1Preface — What Lewis Means by 'Mere Christianity'6 questions
  2. Week 2Book I, Chapter 1 — The Law of Human Nature6 questions
  3. Week 3Book I, Chapter 2 — Some Objections6 questions
  4. Week 4Book I, Chapter 3 — The Reality of the Law6 questions
  5. Week 5Book I, Chapter 4 — What Lies Behind the Law6 questions
  6. Week 6Book I, Chapter 5 — We Have Cause to Be Uneasy6 questions
  7. Week 7Book II, Chapter 1 — The Rival Conceptions of God6 questions
  8. Week 8Book II, Chapter 2 — The Invasion6 questions
  9. Week 9Book II, Chapter 3 — The Shocking Alternative6 questions
  10. Week 10Book II, Chapter 4 — The Perfect Penitent6 questions
  11. Week 11Book II, Chapter 5 — The Practical Conclusion6 questions
  12. Week 12Book III, Chapter 1 — The Three Parts of Morality6 questions
  13. Week 13Book III, Chapter 2 — The 'Cardinal Virtues'6 questions
  14. Week 14Book III, Chapter 3 — Social Morality6 questions
  15. Week 15Book III, Chapter 4 — Morality and Psychoanalysis6 questions
  16. Week 16Book III, Chapter 5 — Sexual Morality6 questions
  17. Week 17Book III, Chapter 6 — Christian Marriage6 questions
  18. Week 18Book III, Chapter 7 — Forgiveness6 questions
  19. Week 19Book III, Chapter 8 — The Great Sin6 questions
  20. Week 20Book III, Chapter 9 — Charity6 questions
  21. Week 21Book III, Chapter 10 — Hope6 questions
  22. Week 22Book III, Chapter 11 — Faith (Part I)6 questions
  23. Week 23Book III, Chapter 12 — Faith (Part II)6 questions
  24. Week 24Book IV, Chapter 1 — Making and Begetting6 questions
  25. Week 25Book IV, Chapter 2 — The Three-Personal God6 questions
  26. Week 26Book IV, Chapter 3 — Time and Beyond Time6 questions
  27. Week 27Book IV, Chapter 4 — Good Infection6 questions
  28. Week 28Book IV, Chapters 5–11 — The New Men6 questions
  29. Week 29Review & Reflection — Looking Back Across the Whole Book8 questions

Week 1: Preface — What Lewis Means by 'Mere Christianity'

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Read the Preface of Mere Christianity.

1.Lewis uses the image of a hallway leading into separate rooms to describe 'mere Christianity.' What is the hall, and what are the rooms? Why does he think it matters to get people into the hall before worrying about which room they enter?

2.He deliberately avoids advocating for any particular denomination. Do you find this approach reassuring or frustrating? What might be gained — and lost — by focusing only on what all Christians share?

3.Lewis admits that some of his positions will offend everyone at some point. He sees this as a sign he is being honest rather than merely diplomatic. Do you think that's a fair standard? Can you think of a belief you hold that genuinely offends people on both sides of an argument?

a.Have you ever softened a conviction to avoid upsetting someone? What happened?

b.How does Lewis's posture here model a kind of intellectual courage you'd want to develop?

4.Lewis says the book is not primarily aimed at 'the converted.' Who do you think is the ideal reader of *Mere Christianity*? Where do you locate yourself on that spectrum right now?

5.The Preface was added later, after the radio talks. What does the care Lewis takes in defining his terms suggest about how he thinks good argument and good faith work together?

6.As you begin this study, what is your single biggest question or area of doubt about Christianity? Write it down. We'll return to it at the end of the guide.

Week 2: Book I, Chapter 1 — The Law of Human Nature

All 6 questions

Read Book I, Chapter 1 of Mere Christianity ('The Law of Human Nature').

1.Lewis begins with the observation that when people quarrel, they appeal to a standard they both assume the other person knows — 'That's not fair,' 'You promised.' What is he trying to show with this simple, everyday observation?

+ 5 more questions in the full guide

Week 3: Book I, Chapter 2 — Some Objections

All 6 questions

Read Book I, Chapter 2 of Mere Christianity ('Some Objections').

1.The first objection Lewis takes up is that the Moral Law is just herd instinct. How does he distinguish between a moral impulse and a moral law? What is the analogy he uses about two different impulses (such as helping someone in danger vs. self-preservation)?

+ 5 more questions in the full guide

Week 4: Book I, Chapter 3 — The Reality of the Law

All 6 questions

Read Book I, Chapter 3 of Mere Christianity ('The Reality of the Law').

1.Lewis argues that the Moral Law is not simply a description of how humans behave but a *prescription* of how they ought to. What is the difference, and why does it matter for his argument about God?

+ 5 more questions in the full guide

Week 5: Book I, Chapter 4 — What Lies Behind the Law

All 6 questions

Read Book I, Chapter 4 of Mere Christianity ('What Lies Behind the Law').

1.Lewis presents two broad views of the universe: the Materialist view (matter and energy, nothing more) and the Religious view (something behind the facts). In your own words, what is the essential difference between these two positions?

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Week 6: Book I, Chapter 5 — We Have Cause to Be Uneasy

All 6 questions

Read Book I, Chapter 5 of Mere Christianity ('We Have Cause to Be Uneasy').

1.Lewis says he has been 'putting the boot in' — deliberately making the reader feel the weight of the Moral Law's condemnation before offering any relief. Why does he think this sequence matters? What is wrong with offering comfort too soon?

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Week 7: Book II, Chapter 1 — The Rival Conceptions of God

All 6 questions

Read Book II, Chapter 1 of Mere Christianity ('The Rival Conceptions of God').

1.Lewis opens Book II by distinguishing between Pantheism (God is everything, or the sum of reality) and Theism (God made the world and is distinct from it). What are the practical differences between these two views for how we think about good and evil?

+ 5 more questions in the full guide

Week 8: Book II, Chapter 2 — The Invasion

All 6 questions

Read Book II, Chapter 2 of Mere Christianity ('The Invasion').

1.Lewis describes the Christian story as 'enemy-occupied territory.' What does this metaphor capture about the human condition and about God's response to it? What might be lost with a gentler metaphor?

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Week 9: Book II, Chapter 3 — The Shocking Alternative

All 6 questions

Read Book II, Chapter 3 of Mere Christianity ('The Shocking Alternative').

1.Lewis presents the famous 'Liar, Lunatic, or Lord' trilemma. What is the argument, and what is it designed to rule out? In your own words, why does Lewis think the 'just a great moral teacher' option is not available?

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Week 10: Book II, Chapter 4 — The Perfect Penitent

All 6 questions

Read Book II, Chapter 4 of Mere Christianity ('The Perfect Penitent').

1.Lewis frames the problem this way: a man who is in debt cannot pay what he doesn't have; a man who has wronged God cannot give back what he's taken. He needs help from outside. How does this frame the need for the Atonement differently from simply 'needing forgiveness'?

+ 5 more questions in the full guide

Week 11: Book II, Chapter 5 — The Practical Conclusion

All 6 questions

Read Book II, Chapter 5 of Mere Christianity ('The Practical Conclusion').

1.Lewis describes three ways Christ's 'good infection' (as he calls it) is passed on: through baptism, belief, and the Lord's Supper. He doesn't ask us to fully understand *how* these work, but to use them. What is the analogy he draws to eating food without understanding nutrition? Do you find this analogical approach helpful?

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Week 12: Book III, Chapter 1 — The Three Parts of Morality

All 6 questions

Read Book III, Chapter 1 of Mere Christianity ('The Three Parts of Morality').

1.Lewis uses the fleet-of-ships analogy to describe the three departments of morality: relations between ships, the internal workings of each ship, and the purpose of the whole fleet. What are the three corresponding dimensions of human morality?

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Week 13: Book III, Chapter 2 — The 'Cardinal Virtues'

All 6 questions

Read Book III, Chapter 2 of Mere Christianity ('The "Cardinal Virtues"').

1.The four Cardinal Virtues are Prudence, Temperance, Justice, and Fortitude. Lewis says they are 'cardinal' because everything else hinges on them ('cardo' means hinge). Before reading further in the chapter, can you define each one? How do your definitions compare to Lewis's?

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Week 14: Book III, Chapter 3 — Social Morality

All 6 questions

Read Book III, Chapter 3 of Mere Christianity ('Social Morality').

1.Lewis states that the New Testament gives almost no direct political program, and he is deliberately reticent about translating Christianity into specific policy. Why does he take this position? Do you agree with his restraint, or do you think Christianity has more specific social implications than he allows?

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Week 15: Book III, Chapter 4 — Morality and Psychoanalysis

All 6 questions

Read Book III, Chapter 4 of Mere Christianity ('Morality and Psychoanalysis').

1.Lewis argues that psychoanalysis and Christianity are not rivals but operate on different levels. Psychoanalysis deals with the material of our instincts and complexes; Christianity deals with what we *do* with that material. What is the distinction he is drawing, and why is it important?

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Week 16: Book III, Chapter 5 — Sexual Morality

All 6 questions

Read Book III, Chapter 5 of Mere Christianity ('Sexual Morality').

1.Lewis uses the analogy of an audience that goes wild watching a strip-tease act with food to introduce his argument about the state of sexual appetite in modern culture. What is he suggesting about the relationship between the appetite and the culture that feeds it?

+ 5 more questions in the full guide

Week 17: Book III, Chapter 6 — Christian Marriage

All 6 questions

Read Book III, Chapter 6 of Mere Christianity ('Christian Marriage').

1.Lewis distinguishes between 'being in love' (a feeling that comes and goes) and the commitment of marriage. What does he say about the relationship between the two, and why is this important for understanding the Christian view of marriage?

+ 5 more questions in the full guide

Week 18: Book III, Chapter 7 — Forgiveness

All 6 questions

Read Book III, Chapter 7 of Mere Christianity ('Forgiveness').

1.Lewis begins by saying forgiveness sounds fine in the abstract until you actually have someone to forgive — a neighbor who has wrecked your life, a nation that has done monstrous things. How does his opening move the discussion out of the theoretical and into the real?

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Week 19: Book III, Chapter 8 — The Great Sin

All 6 questions

Read Book III, Chapter 8 of Mere Christianity ('The Great Sin').

1.Lewis identifies Pride as the great sin — the root of every other vice. He says it is essentially competitive: we are not proud of having something so much as proud of having *more* of it than the next person. Do you find this competitive dimension in your own experience of pride?

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Week 20: Book III, Chapter 9 — Charity

All 6 questions

Read Book III, Chapter 9 of Mere Christianity ('Charity').

1.Lewis insists that 'charity' in the Christian sense means love — not just generosity with money. He says Love (in the sense of willing the good of another) is a virtue, not a feeling, and therefore it can be commanded. Why does it matter whether love is primarily a feeling or a choice?

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Week 21: Book III, Chapter 10 — Hope

All 6 questions

Read Book III, Chapter 10 of Mere Christianity ('Hope').

1.Lewis says that hope — longing for the eternal world — is not a form of escapism but one of the things a Christian is meant to do. He argues that people who have contributed most to the world have been precisely those who were most focused on the next. Who are the examples he has in mind, and do you find this claim persuasive?

+ 5 more questions in the full guide

Week 22: Book III, Chapter 11 — Faith (Part I)

All 6 questions

Read Book III, Chapter 11 of Mere Christianity ('Faith').

1.Lewis defines Faith (in a first sense) as the art of holding on to things your reason has once accepted, in spite of your changing moods. Why does he say this takes courage, and what does it suggest about the relationship between faith and emotion?

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Week 23: Book III, Chapter 12 — Faith (Part II)

All 6 questions

Read Book III, Chapter 12 of Mere Christianity ('Faith' — the second part).

1.Lewis distinguishes between faith as intellectual assent and faith as the total self-surrender he describes here. Why does he say that the virtuous pagan (someone who works very hard at being good) may actually be further from salvation than someone who knows they cannot manage it at all?

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Week 24: Book IV, Chapter 1 — Making and Begetting

All 6 questions

Read Book IV, Chapter 1 of Mere Christianity ('Making and Begetting').

1.Lewis distinguishes between 'making' and 'begetting.' A man makes a statue; he begets a child. The statue is made of different stuff; the child is of the same kind as the father. How does this distinction apply to the relationship between God and human beings — and to the relationship between God the Father and God the Son?

+ 5 more questions in the full guide

Week 25: Book IV, Chapter 2 — The Three-Personal God

All 6 questions

Read Book IV, Chapter 2 of Mere Christianity ('The Three-Personal God').

1.Lewis argues that prayer is the place where we discover the Trinity in practice — we speak to the Father, through the Son, with the Spirit. How does his description of prayer as being caught up into a divine exchange between Father, Son, and Spirit make prayer feel different from one-way communication?

+ 5 more questions in the full guide

Week 26: Book IV, Chapter 3 — Time and Beyond Time

All 6 questions

Read Book IV, Chapter 3 of Mere Christianity ('Time and Beyond Time').

1.Lewis argues that God does not experience time the way we do — he does not live in a 'succession of moments' but sees all moments simultaneously, as we see a landscape spread out before us. How does this resolve the apparent problem of God 'foreknowing' our free choices?

+ 5 more questions in the full guide

Week 27: Book IV, Chapter 4 — Good Infection

All 6 questions

Read Book IV, Chapter 4 of Mere Christianity ('Good Infection').

1.Lewis revisits the idea of the Son of God as the source of Zoe — the divine life — and argues that through Christ this life is 'catching.' What does the infection metaphor capture that a more formal theological explanation might miss?

+ 5 more questions in the full guide

Week 28: Book IV, Chapters 5–11 — The New Men

All 6 questions

Read Book IV, Chapters 5 through 11 of Mere Christianity ('The Obstinate Toy Soldiers,' 'Two Notes,' 'Let's Pretend,' 'Is Christianity Hard or Easy?,' 'Counting the Cost,' 'Nice People or New Men,' and 'The New Men').

1.In 'The Obstinate Toy Soldiers,' Lewis describes the Incarnation as God becoming a wooden soldier in order to turn wooden soldiers into real people. What does this earthy image capture that more technical atonement language might obscure?

+ 5 more questions in the full guide

Week 29: Review & Reflection — Looking Back Across the Whole Book

All 8 questions

Review your notes from all sections of Mere Christianity. You may want to re-read the Preface and the final chapter of Book IV.

1.At the beginning of the guide you were asked to write down your biggest question or area of doubt about Christianity. Pull that out now. Has it been answered, deepened, or replaced by a different question? What has the journey through this book done with it?

+ 7 more questions in the full guide

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