What was Owen Meany’s dream and why was it so significant

Owen Meany has a recurring dream. We don't know the specifics of that dream, but we do know that Owen regards it as a religious vision. Unfortunately for him, no one else does. John Wheelwright, for one, dismisses it as just a dream, nothing more. It's notable that none of the other characters in the story share Owen's vision, not least because of the fanaticism with which he expresses his deep conviction that he's some kind of divine messenger.
Owen's dream/vision is important because it highlights the spiritual hole at the heart of contemporary society, a hole that cannot be filled either by embracing a thoroughgoing secular worldview or subscribing to the teachings of the established churches. The conflict that Irving presents us with is not the old false dichotomy between faith and reason, but the much more complex, more interesting battle between meaning and meaninglessness. Owen and his visions are a part of that battle, representing an attempt, however imperfect, to give meaning to life in a society that seems to have lost all understanding of it.