The Restoration Movement consists of three main groups: the Churches of Christ, the Christian Church (Disciples of Christ), and the independent Christian Church/Church of Christ. I understand that they share the hope for the unification of all Christians in a single body patterned after the church of the New Testament (also called the "primitive church"). But I'm unclear as to what that means in terms of specific doctrines and practices. In addition to knowing what distinguishes them from other Protestant denominations I would like to know what divides them from each other.
I once had two conversations in one week with Restoration clergymen: a seminary administrator of the Church of Christ and minister of the Disciples of Christ. I remember telling one of them, "that sounds a lot like what I heard from the guy from the seminary down the road." He replied, "I can tell you the difference between us in two words: '88 keys.'" He was referring to the fact that one of them allows only a cappella singing, while the other allows musical instruments. But is that really all the divides them? Can that really be the whole story?
What are the distinguishing characteristics of the Restoration (Stone-Campbell) movement and its various denominations, both in relation to Protestantism generally and in relation to each other?