One of the questions that has tickled my brain for years now is how the church can effectively preach the gospel in the postmodern context. Lots of people have written about this, and I usually revert back to Lesslie Newbigin, who said presciently in the 1960s that "the best apologetic for the gospel is a community that believes it."
So in essence the first work of evangelism is actually the cultivation of a community that lives out the gospel. Not totally, of course, but there must be some sense of differentness about the people called church. This way the words of the gospel flow out of a praxis of the implications of the gospel, making the proclamation much more powerful.
Apparently others are fascinated by such questions, too. Halden quotes J.C. Hoekendijk, who claims that in contexts where there is no Christian memory, where there is no initial belief to call people back to, evangelism must look very different from the revival meeting tradition that most of Protestantism comes out of. Specifically we must think about our culture as a mission field and ourselves as missionaries, bringing the gospel to people who really don't know anything about it. Thus if we look to mission contexts to learn lessons, we find interesting results. Hoekendijk writes:
No-Man’s-Land shew remarkable similarity of structure. The pattern of
work of these new methods may be summarised as follows: to make clear
the meaning of the word of proclamation (kerygma) by means of a life lived in fellowship (koinonia) and finding its expression in simple service (diakonia)."
To me, that seems to get down to the fundamentals of preaching the gospel in a postmodern context: we make a clear pronouncement of the gospel, which is intricately bound up with a life lived in fellowship with others (the embodied witness of the church), but this life of fellowship is not a segregated society, but one that lives in and among the people they seek to impact with the gospel, living lives of simple service to people and their culture. Kerygma, koinonia, and diakonia sums it up very nicely.