A series of questions worth pondering:
While McKnight may overuse the unified, catholic image of "the church" the point remains worth considering. This isn't the say that we should discourage people from thinking about the person of Jesus of Nazareth as he is "accessed" through historical-critical research, but we may want to temper any language that suggests that this will lead us to the "real" or "actual" Jesus. The historian's Jesus is just that: a Jesus re-constructed using modern historiography in all it's strengths and weaknesses. And historiography isn't static.