If you get a chance check out the post I left on Helen Burgess's page on this site. Helen Burgess was a young contract player for Paramount who made four films. One of them was Cecil B. DeMille's The Plainsman where she played the second lead female role as Louisa Frederici Cody under Gary Cooper, Jean Arthur, and James Ellison. She died of pneumonia at the age of 19 as the film was being released. This would have been a breakout role for her and she might have had a long screen career.
I'm sure that the creators of this film had Helen Burgess in mind when they made it. It's good in spots, I like the performances of Fred MacMurray, Alida Valli, Lee J. Cobb and Philip Ahn which another reviewer very correctly singled out.
I guess since Bing Crosby made such a hit as a priest Frank Sinatra had to try it. He lays one big omelet as Father Paul. He had to wait until Meet Danny Wilson for a part he could carry on acting as well as singing.
This film was also made in the days of John L. Lewis as head of the United Mine Workers. One of the big issues for that union was the pollution that caused the premature deaths of a lot of their members and families. In that sense Miracle of the Bells was a very socially relevant movie for its time and even today.