Well, this topic is something I happen to know something about and, believe me, Hitchens doesn't know. I happen to be a Christian believer and Hitchens obviously is not, and that might skew both of us, but I can unskew myself for a second and say with confidence, he still doesn't know.
I've always found it interesting that there are various obscure texts that surface and purport to be the "true teachings of Jesus," just as there are all kinds of groups that claim to have the "true teachings of Jesus," (Moonies, Muslims, Mormons, even a Hare Krishna that I ran into in the Appalachian mountains), and people lap it up, but to claim that the historic church and its scriptures, that go back to the time of Jesus' apostles, actually have the true teachings of Jesus, well, that just isn't possible.
Not to mention the success of the Da Vinci code.
As to a partial explanation as to why that is..."for the Word of God...is a discerner of the thoughts and intents of the heart"
I have a hard enough time as it is,having the thoughts and intents of my heart totally known to another (considering I'm nowhere near 100% certain of them myself half the time!) and I know I am accepted!