The Poseidon Adventure
People have pointe dout the similarity between this film and the run of disaster movies that came in the next decade. But they didn't mention the most obvious parallel: The Poseidon Adventure, which also has a clergyman who has lost his faith as the hero. In fact, I wonder if Paul Gallico saw this before he wrote that story.
This film seems fully as good as that one. One wonders why it didn't have the same level of success.