This is (Outside CS Lewis) the best apologetics book I have ever read.
What's So Great About Christianity by Dinesh D'Souza
From Amazon:
*Why Christianity explains what modern science tells us about the universe and our origins--that matter was created out of nothing, that light preceded the sun--better than atheism does
*How Christianity created the framework for modern science, so that Christianity and science are not irreconcilable, but science and atheism might be
*Why the alleged sins of Christianity--the Crusades, the Inquisition, the Galileo affair ("an atheist's fable")--are vastly overblown
*Why atheist regimes are responsible for the greatest mass murders of history
*Why evolution does not threaten Christian belief, but actually supports the "argument from design"
*Why atheists fear the Big Bang theory and the "anthropic principle" of the universe, which are keystones of modern astronomy and physics
*How Christianity explains consciousness and free will, which atheists have to deny
*Why ultimately you can't have Western civilization--and all we value from it--without the Christianity that gave it birth.
I recommend D'Souza's book, "What is so great about Christianity." It is brilliant.