He calls Heaven “deaf”. This hints at anger and self pity. It is not the statement of an unbeliever.
Good call--it sounds as if there was something he prayed for desperately that he didn't get. He sounds like C. S. Lewis in his atheist days, when he didn't believe that God existed, and was very angry with Him for not existing.
People like Hitchens are closer to being believers than they want to admit, or even suspect. The passion and vehemence with which they proclaim their disbelief often means that they are very invested in the idea of God, but sort of on the "dark side" of the subject. An anger because of failed expectations of God can indicate a strong need to believe.
Or it could indicate that he just enjoys yanking believers' chains.