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This became clear today as we discussed Noll's chapter on the Council of Nicaea and the conversion of Constantine, which started and ended with discussion of political questions in 4th century Rome, discussing theology only in the middle. Nothing in his presentation excludes the view that Constantine's conversion may not have been sincere, that he was using the Christian church to pacify his empire, even as the bishops were using him to establish themselves while the theological stuff was epiphenomenal; indeed, he offers us the materials for such a view. When students in some consternation wondered "But isn't he supposed to be doing a Christian history of Christianity?" I responded, inspired: the most cynical and apparently anti-Christian account could be true and the religious view also true. Human beings are sinners, but God brings good out of evil. And indeed Noll gave notice in his introduction that this was one of the things the history of Christianity taught - that God looks out for his church and preserves it, despite the failings of human beings.
There is no more a single Christian way of doing the history of Christianity (or anything else) than there is a single secular way. It was interesting to discover in Noll the materials for what you might call a "total depravity" history of Christianity. The agents of history are sinners, impure of motive and probably deluded about their own virtue. Some are aware of this and penitent, but none is without sin, and so human history will inevitably be a history of vice and hypocrisy and overreaching, if also of penitence and whatever helps the repentant sin no more. How fortunate that sinful human beings aren't the only agents of human history!