The Son of Maryam" is the story about Rahman, a milk delivery boy in a small village in Iran and the village's mosque crier. Rahman, Muslim, befriends a priest who lives in a church on the outskirts of town. When the priest is seriously injured in an accident, Rahman cares for him and goes into the city to find the priest's brother. While in the city he observes a Christian service for the first time and learns of the similarities between Christianity and Islam. Upon his return to the village, Rahman discovers that the priest has died and the the village mourners begin their pilgrimage for the Ashura celebrations.

Overview from IMDb.com