It wasn't taking any faith for him to place his foot down on a piece of dry land if it was already dry all the way across. My prediction is that it might not have even rolled back except as they walked. Faith will never be understood down here. Elijah, Moses, Abraham, Jeremiah, Isaiah, Micah, and many others, especially Jesus, were not understood. They weren't understood down here and you won't be.
Faith is victory.
Faith is living the overcoming life. Faith is more forceful than fire. Faith is the key to the lions' jaws. Faith is the power that destroyed the walls of Jericho. The Word of God.