The clue is in the “Did You Know?” section of the IMDB article you linked to.
It mentions that the current film is an expansion of a 2003 short film with the same name, with same director and same writer.
Here is part of the IMDB plot summary for that short film:
St. Agnes Academy has a new principal, Father Benet, and a classroom of ten-year-olds that includes Sister Mary Gilbert, straight-A-student Mary Brown, and a precocious scholarship boy, Henry Harvin. Students report on their heroes: Mary’s is Jesus Christ, whose middle initial she says is “H” - their former principal, an aging nun whose picture is on the wall, told her so.