Almost every clause of the Ave Maria is about relationships between the mortal and the divine, either calling to mind relationships that are in good condition, calling to mind relationships that are in lamentable condition, or petitioning for help to restore them, or calling to mind the distinction. It seems unlikely that an adaptation would have much power without taking that as a starting point. Have you worked out what either the equivalent relationships or a corresponding theme in a Heathen context would be?