The similarities between Herman Melville's novel
            Moby Dick, and the story of Jonah in the Bible center around the
            whale, and the faith of the two protagonists.
In the story
            of Moby Dick, the major conflict revolves around Captain Ahab and
            his obsession to kill the white whale, Moby Dick, who maimed him the last time they
            confronted one another. Ahab is named after a wicked Biblical king in the Old Testament.
            Ahab is a Quaker—allegedly a man of God—and is supposed to be a pacifist (peacemaker),
            but has turned his back on his faith. He has lost sight of everything but killing the
            whale who he sees as the personification of evil. His unhealthy preoccupation with
            destroying the whale ultimately brings about the death of the entire crew, except for
            Ishmael.
In the story of Jonah, he, too, is a man of God.
            He has been called by God to go speak to the people of Nineveh. Jonah did not want to do
            so, so in essence, he too turned his back on God and boarded a boat to take him in the
            opposite direction. Soon a storm assaulted the boat, and Jonah, sure that he was the
            reason for the danger the ship was in, convinced the ship's crew to throw him overboard
            in order to save themselves. They did so, and Jonah was swallowed by a great fish (which
            we would refer to as a "whale.") When he repents, he visits Nineveh, and the people make
            peace with God and are saved.
Similarities are as follows:
            both are religious men; each has an experience with a whale; each man turns his back on
            his faith.
Differences are as follows: both men turn their
            back on God. Ahab never finds his way back to God and brings about the destruction of
            the majority of his crew. Jonah, on the other hand, saves the lives of the crew members
            on his ship and he turns himself around and fulfills God's purpose, saving the people of
            Nineveh.
While the whale brings about Ahab's death, it is
            the whale that saves Jonah from drowning.
Melville used
            many Biblical allusions in the classic tale of Ahab and the white whale Moby
            Dick.
