Though doubt, alienation, and even parody are elements in some of these poems, the collection is quite appropriately aware that these all have reference to the field of thought and meaning ordinarily called religious. Any reader of Ecclesiastes or the Book of Job is aware that the canon of scripture has room for thought that can disrupt conventional assumptions about the nature of belief, whether these assumptions are held by the religious or by their critics. ... To associate religion with unwavering faith in any creed or practice does no justice at all to its complexity as lived experience. Creeds themselves exist to stabilize the intense speculations that religion, which is always about the ultimate nature of things, will inspire.
But really, read the whole thing.