An interesting thread among many religions is the timing of the "great reveal". It tends to cast people before x time into darkness and ignorance, like cavemen, and everyone after as being more capable of their own enlightenment or ignorance. And the great reveal often comes down to a single person, whether Muhammad or Joseph Smith.
For the time-eternal nature of God, I guess it makes more sense to see the bridge from the divine to humanity as being something much more bound to calendar dates in revolutionizing faith and therefore enlightenment. But it often struck me as very ethnocentric, very time-centric, and very cultural-centric -- i.e., to the degree that the human element of religion becomes far more potent than the diety itself.
Call me crazy. I just find it odd that for all the eternity humans place in the divine, we as a species often attribute our popular spiritual awakenings to singularities in time that seem to have a lot more in common with once-a-year department store sales than with the expanse of religious experience per se.
An old history teacher I had loved the old Voltaire saying, "History is but a pack of tricks we play on the dead." The analog is that the great religious separation between light and darkness, pinned to our calendars, is often a great trick we play on the dead.