The parish priest looks to create a Nativity scene for his church, but his congregation is too poor to afford the statuary dealer's price for a statue of baby Jesus. The miracle, then, is that the faithful's prayers are answered by the appearance of angels and the Virgin Mary, who present them with a statue.

Source: TMDB

Alice Guy-Blache is often credited with the movie, but it is not mentioned in the filmography in her memoirs. The reason may be that the film is a surviving example of "miracle films" that she regularly produced for Gaumont, and thus an ordered product, that presented Catholicism and was often typically Christmas themed. The camera operator is possibly Alice Guy herself, or Anatole Thiberville.

A poor priest can’t afford to buy a baby Jesus for his manger. When he explains to his parishioners why there is no baby in the cradle, the Virgin and two angels appear at the altar and present him with a baby.

Source: Ngā Taonga