To celebrate the 100th anniversary of film in 1995 the Vatican came out with a list of the most important movies of the previous century. The list was divided into three categories: Values, Religion, and Art with fifteen films in each. Aficionados will quibble with some of the selections (Bergman's Wild Strawberries?) and some of the omissions (Bergman's Winter Lights?), but it is an excellent reference for parents who wish to expose their children to good movies, although, to be sure, not all of the films are appropriate for children. Also, many of the films are foreign and may not be accessible to English-only viewers.
These are the top fifteen films in the Religion category:
Andrei Rublev * Andrei Tarkowsky (1969, USSR)
The Mission * Roland Joffe (1986, UK)
La passion de Jeanne d'Arc (The Passion of Joan of Arc) * Carl T. Dreyer (1928, France)
La vie et la passion de Jesus Christ (Life and Passion of Christ) * Ferdinand Zecca and Lucien Nonguet (1905, France)
Francesco, giullare di Dio (The Flowers of St. Francis / Francis, God's Jester) * Roberto Rossellini (1950, Italy)
Il vangelo secondo Matteo (The Gospel According to Matthew) * Pier Paolo Pasolini (1964, France/Italy)
Therese * Alain Cavalier (1986, France)
Ordet (The Word) * Carl T. Dreyer (1955, Denmark)
Offret - Sacrificatio (The Sacrifice) * Andrei Tarkowsky (1986, Sweden/UK/France)
Francesco * Liliana Cavani (1989, Italy/Germany)
Ben-Hur [A Tale of the Christ] * William Wyler (1959, USA)
Babettes gustebud (Babette's Feast) * Gabriel Axel (1987, Denmark)
Nazarin * Luis Bunuel (1958, Mexico)
Monsieur Vincent * Maurice Cloche (1947, France)
A Man for All Seasons * Fred Zinnemann (1966, UK)
The rest of the list and commentary by Steven Greydanus can be found here.