Jaroslav Pelikan is generally recognized as one of the most important American historians of Church history. He was the son of a Lutheran pastor (the Luther connection!), and one himself until he joined the Orthodox Church in America a few years before his death. His magnum opus is the five-volume set The Christian Tradition: A History of the Development of Doctrine. Why am I telling you this: because he recorded an hour-long interview on the radio show Speaking of Faith a few years ago on the use and benefit of the historic Christian creeds. Well worth the listen. You can find it here.