Our faith in God seems so small in comparison with the great and enormous winds and waves that surround us. But in today's gospel is the answer. The disciples had only a little faith, but they invested it in a big Lord, and they were not destroyed. In a sermon on this text, Martin Luther said that the little faith the disciples had was enough in the presence of Jesus Christ. Big faith doesn't need Christ's presence.
Little faith does.
And faith as tiny even as a mustard seed is sufficient, when Jesus Christ is on board with you. You see, the real issue is not how much faith we have. The issue is how much power God has. Churches that keep telling people they need to have more faith are placing the emphasis on faith as a good work which somehow entitles us to the grace of God. Telling people they need to have more faith is not good news, but bad news.