This is, by far, one of the most interesting, maybe even the best, novel I have read (or, in this case, listened to) this year. Compelling, fascinating characters, fantastic world-building, and an engaging story, intertwined with interesting and shrewd discussions of philosophy and religion all contribute to a superb narrative. This is, basically, a coming-of-age story for the young protagonist, as well as a story of enlightenment and finding a way towards humanism. I can only recommend it, as especially its musings on religion and philosophy are delightful and magnificently executed.
I would, however, recommend reading the text rather than listening to the audiobook. It is very well-narrated, but the length (25 hours) and the (in parts) complexity of subjects might make you want to reread or retrack certain paragraphs or passages. There is no complex language, which makes following the arguments much easier, but still, I think one would benefit more from reading it way more than simply listening to it...