This book does little to persuade anyone, much less a firm atheist, to become a Christian. I have read good Christian apologetic books (The Case for Christ, for example) and in comparison this book fails miserably. Lewis uses silly arguments (Moral Law? Please) to try and convince his audience, but it merely solidifies the atheist's viewpoint that ninety percent of Christian arguments are far-fetched and preposterous. Most of the book is about how a Christian should live, but what good is talking about a Christian life if he can't convince the reader that Christianity is true?