I first saw this movie when I was a kid. The story is is meant as light hearted fun. Moves quickly, and with Edmund Gwen you can't go wrong. It's one of those classics meant to pass a bit of time coming away with a feeling of enjoyment. Whether intended or not it managed to stay with me my whole life. Sally forgets her lunch one day, and prays to Saint Anne, when she gets in trouble for where she left her lunch she calls Saint Anne a snitched. Two nuns over hear her, one thinks its impudence the other calls it faith. As time goes on others also have faith in Sally praying to Saint Anne.
whether Catholic, or not, it's just fun movie, it never gets religious, doesn't preach at audiences. If looking for a more devotional type film, try Joan of Arc, or Our Lady of Fatima. If looking for the kind of light hearted humor, with core value of family's stick together, and yes some Irish stereotypes of the era, this is one to watch. Hard to find, rarely aired, but worth the time to watch.