"I Don't Have Enough Faith to Be an Atheist", by Norman L. Geisler and Frank Turek is a book that attempts to make a systematic case in defense of Christianity. I say, "systematic," because they go to great lengths to build their case in the proper order with each chapter building off the last. In other words, if you want a book where you can hop around from chapter to chapter, I would not recommend this book.
My summary of the book is as follows. It is a well crafted scientific, philosophical, historical, and textual argument for Christianity. Starting with a defense that truth about reality is knowable and working all the way to evidence for Christ's resurrection, their argument is like a snowball rolling down a large hill, getting larger and larger as it goes. While reading this book I felt like I was watching a wise cracking lawyer lay out fact after fact reinforcing his case, growing more and more confident as he goes.
My two criticisms of this book are what I would call the "sassy" tone the authors sometimes have. It comes across as slightly arrogant and would probably turn off some skeptics who read this book. My second criticism is Norman Geisler's insistence on grinding his "free will" axe in the last two chapters. To those who think views on free will do not affect the Gospel, I put forth Norman Geisler's Gospel presentation at the end of this book as exhibit-A.
However, the overall good in this book completely overshadows my two criticisms. I would recommend this book to anyone, whether you are a Christian looking for solid arguments to defend your faith or if you are a skeptic who thinks you've got enough proof to reject Christianity. This will be a book I reference often.