For the meantime, Tim Keller of Redeemer Presbyterian Church in Manhattan discusses Christians as "Salt and Light in Culture" in another of the Desiring God Conference video interviews. At the end of the day, I don't know whether his vision of Christianity as salt and light would look like mine, but I really like the way he describes his vision:
I think that the "cultural transformationalists" have underemphasized the importance of thick, strong Christian communities who serve as counter-cultures. The Anabaptists and the Hauerwasians and all that—they've put all the emphasis on really, really strong Christian counter-cultures that show the world how people ought to live, rather than trying to get out there into the culture and bring your Christian worldview into it.It seems to me that the worst of all worlds is when 1) cultural redeemers live in culture and think they're redeeming it when they're really just wallowing in the world, while 2) separatists create a counter-culture and think they're confronting mainstream culture with true spirituality when they're really just wallowing in religious pride.
I don't know why you can't do both. I have never been able to understand why you can't do both. I think that the traditions tend to . . . each tradition tends to be weak because it doesn't do the other.