Magnificent Obsession is framed as a series of letters to a person looking for answers in the faith scene, and focuses on dealing with the false ideology offered by atheists. Christopher Hitchens is his particular bête noire in this book, and Robertson puts many of that intellectual's false claims about Christianity in their place.
I like Robertson's humility - he doesn't claim to be on the same intellectual level as someone like Hitchens (though he's plainly no slouch in the brains department) - and I like the way he keeps coming back to the basics: Jesus Christ is the focus of the book. Everything else takes second place.
An atheist may not agree with his beliefs, but that's not to say that people haven't found Christ through Robertson's work online as his other book, The Dawkins Letters shows.
Well worth reading, whether you're a Christian already, or someone seeking to find the truth.
My only quibble was with the production of the ebook format: disappointingly, it's probably the worst I've come across. Italicized words are joined to whatever plain print word comes next, and the numbers connecting to footnotes are almost always a space away from the word they relate to, and joined to whatever is the next word in the sentence. On top of this are several typos
David Robertson, author of The Dawkins Letters, was told by the leader of an atheist society: "Okay, I admit that you have destroyed my atheism, but what do you believe?" His answer was "I believe in and because of Jesus." This book shows us why Jesus is the reason to believe. In response to the shout of "God is not Great" by the late Christopher Hitchens, David shows us why Jesus is God and is Great.