Rachel Crothers' thoughtful stage play Susan and God was tastefully adapted for the screen by Anita Loos. Joan Crawford stars as Susan, whose unquestioning devotion to various religious organizations causes a great deal of strain between herself and her family. When Susan embraces a "New Thought" theological movement, she decides to apply the tenets of this new philosophy to patch up the unhappy marriages within her own social circles. She succeeds only in making things worse, and in further harming her own relationship with husband Barrie (Fredric March) and daughter Blossom (Rita Quigley). But it is the unadorned, unpretentious religious faith of little Blossom that ultimately brings Susan and Barrie together again. When Susan and God was first released in 1940, Joan Crawford's performance was occasionally compared unfavorably to that of Gertrude Lawrence, who created the role of Susan on Broadway; it was suggested by some that Crawford patterned her portrayal exactly on Lawrence's, right down to the line delivery. Modern audiences, denied the opportunity to see Lawrence's interpretation, are less inclined to downgrade Crawford's work, which rates among her best.
~ Hal Erickson, All Movie Guide