What to read next
by C.S. Lewis
Mere Christianity is C. S. Lewis's case for the core beliefs shared across Christian traditions, moving from the moral law that points to God, through the person of Christ, to the practical work of becoming a new kind of person. Groups that finish it often want either more of the same clear-headed reasoning applied to other big questions, or a change of pace that turns from argument to application. The books below split fairly evenly between those two directions: some sharpen the apologetic case further, others turn to the problem of suffering that Lewis touches on but does not dwell on. Any of them will feel like a natural next step for a group used to Lewis's blend of logic and warmth.
Our Mere Christianity guide runs 29 sessions with 176 discussion questions.
These are guides from our own catalog, ordered by how much each book shares with Mere Christianity: subject and themes first, then the kind of group it suits, then the same author. It is an editorial comparison of what the books are about — not a ranking of which is better, and not a claim about what other groups chose.
by Timothy Keller
Keller takes up the question of suffering that Lewis addresses only briefly in Mere Christianity and gives it a full, sustained treatment, drawing on philosophy and real stories rather than radio-length arguments. At 14 sessions it asks more of a group's time and sits in a heavier, more pastoral register than Lewis's brisk chapters.
by John Stott
Stott covers much the same ground as Lewis - who Jesus is and why it matters - with a similarly plain, unadorned style aimed at the same kind of thoughtful newcomer or long-time believer. It is shorter, at 10 sessions, and reads a touch more like a tidy course than Lewis's more meandering, conversational talks.
by Timothy Keller
Keller's book takes on skeptics' objections the way Lewis takes on the moral law and human nature, building a positive case for faith chapter by chapter. It runs a bit longer at 16 sessions and leans more on contemporary city-dwelling doubt than Lewis's wartime audience, but the reasoning style will feel familiar.
by C.S. Lewis
Written by Lewis himself in the same season of life, this book takes one thread from Mere Christianity - why a good God allows suffering - and follows it all the way through. The voice and intellectual habits are the same, though the focus narrows considerably and the sessions run a little shorter, at 13.
by Philip Yancey
Yancey shares Lewis's concern with the reality of suffering but tells it through case studies and personal encounters rather than tight argument, making it a more story-driven, gentler companion. It runs 13 sessions and suits a group ready to sit with hard questions rather than resolve them logically.
by Lee Strobel
Strobel's investigative approach echoes Lewis's insistence that Christianity stands or falls on historical fact, but here the case is built through interviews with scholars rather than one author's own reasoning. At 15 sessions it is more evidence-driven and less philosophical in tone than Mere Christianity.
by Gregory Koukl
Koukl shifts from what to believe toward how to talk about it, a practical companion to the kind of case Lewis builds. It is shorter, at 12 sessions, and far more conversational and skills-focused than reflective.
by Lee Strobel
This companion to The Case for Christ turns from the historical case for Jesus to the hardest objections believers themselves wrestle with, a natural next question after reading Lewis's confident apologetics. It is a shorter study at 11 sessions and keeps Strobel's interview-driven, investigative tone throughout.
Session and question counts checked .