Not so fast there sir! You can't use the lack of a book to follow as a difference.

They don't have a bible, koran, torah, baghavad ghita or any holy book upon with which to base their ideas. Dawkins, Hitchens, Harris, Dennett, Rand, Marx

Dawkins followers have "The God Delusion"
Hitchen's "God is not Great"
Rand "Altas Shrugged", "The Fountainhead" and a number of "non-fiction" polemics
Marx-the Communist Manifesto and enough writings on Communism to fill a small library.

I know Harris and Dennett have books. I just don't know what the names are.