This one won't change the way you see religion, but if you're curious what Jung would say, it's somewhat worth the read. At least it's shorter than Man and His Symbols.

The Psyche is a very important area he looks at in the whole book. I consider the whole book to be a theory on unraveling the unconscious. He argues for the existence of the psyche and he says, " the only form of existence we know of immediately is psychic." He continues that psychical dangers are much more dangerous than epidemics or earthquakes. While I accept with Jung that psychical dangers are dangerous, I believe he has overemphasized the role or place of the Psyche. This is vividly seen in the context of religion. Rather than religious faith being the deepest part of man, it is only a means aided by its symbols to understand the unconscious self.
Unlike Sigmund Freud who looks at religion as an illusion, Jung sees some usefulness in religion and holds that religion is not created by persons as escape valves but they are victims of religion. He sees religion as the collective unconscious that is present in every person's unconscious. The task of religion is to reveal what is in the unconscious and the psyche. This is the reason he validates the use of Christian symbols in uncovering the unconscious.
Jung describes archetypes as "forms or images of a collective nature which occur practically all over the earth as constituents of myths and at the same time as autochthonous, individual products of unconscious origin." Using his theory on archetypes to analyze some of his patient's dreams, he tries to return to the primordial remote times when these things existed. I find his theory on archetypes very problematic. My question is how these primordial things get into the psyche? Are these archetypes present at the time of birth of every child? His theory I believe will presuppose that if we all were helped to unravel the unconscious, we will think alike and behave alike since if we go back to a million or more years ago, we either were children of the same parents or evolved from one family of animals.
He sees in dream a means of unraveling the unconscious. Jung's book is helpful in understanding the psyche and the unconscious. It is however not helpful in understanding authentic religious experiences in people.

This is an excellent work of both psychology and religion, hence the name. There have been other books by Jung that have narrower subjects or more challenging views but this one, takes my Jungian cake. It is so general but yet is exactly what one needs to study or just explore the extremely difficult topic of Psych and Religion. A winner in my book.