Lilies of the Field (1963)

[Faulkner]

@IMDb

Homer Smith, an unemployed construction worker heading out west, stops at a remote farm in the desert to get water when his car overheats. The farm is being worked by a group of East European Catholic nuns, headed by the strict Mother Maria, who believes that Homer has been sent by God to build a much-needed church in the desert.

Some stills from the movie!