First the good news: The appendix, which includes the actual arguments for the existence of a god, is everything that the rest of the book is not: pithy, direct, accessible, amusing. I would love for that section of the book to stand alone. Alone and far away from the laborious, pretentious mess that comprises the body of the work.
As an atheist--a New Atheist, even--I went in to this work of fiction with the highest of hopes. After battering my head against pages of vapid, indulgent narrative, practically unbroken by anything like dialog, plot, or characterization, I gave up. How, you ask, can I judge a book that I did not finish? That is my judgment--it is unreadable (again, except for the excellent appendix).
I feel like a traitor writing this, but if you to want to read a book set in similar environs, centering on a similar topic, try John Updike's "Roger's Version." With its vivid characters, lush descriptions and lively dialog, it is a far more interesting and entertaining read (even though I profoundly disagree with Updike's theistic leanings).
And if you want to read great atheist writers, Salman Rushdie and Ian McEwan are among our finest contemporary novelists, and both are outspoken atheists. But their fiction does not often address atheist themes directly (nor should it--propaganda makes shoddy art).
What I await is a work of popular fiction with atheist themes that sparks and moves. So far the closest thing I know of to a contemporary example is Philip Pullman's fantasy trilogy "His Dark Materials." Surely now that the best-seller lists have been conquered by atheist nonfiction writers, atheistic fiction page-turners cannot be far behind?
I give Ms. Newberger Goldstein a great deal of credit for the work she put into this novel, for the courage it took to write it, and for her obvious intelligence and ability. But what ultimately results, for an average reader like me, are sentences so pregnant with apparent meaning that each must be tediously midwived. Without attractive characters to invite me in, a compelling plot to push me ahead, or intriguing dialog to pull me along, I just can't be bothered.