40 Influential Christian Books
15. The Problem of Pain — C. S. Lewis
C. S. Lewis, in his 1940 classic The Problem of Pain, attempts to reconcile God's goodness and power with the reality of pain, suffering and evil in the world — tackling human sinfulness, animal suffering and the existence of hell — and rejecting these as reasons for disbelief in God.
The Problem of Pain by renowned writer and thinker C. S. Lewis is available here.