My Friend the Devil.

George Dryden, an atheist since he saw his mother struck and killed by lightning as a kid, becomes a prominent surgeon and marries a woman who soon dies of heart disease. Years later, on his daughter's wedding day, he discovers that his wife had a serious love affair with an artist. Infuriated, he drives his daughter away. She becomes ill, suffering an emotional collapse. The doctor exhausts his knowledge trying to save her and finally, in desperation, he calls upon God. The girl is miraculously cured and George Dryden's faith is restored. A lost film.