I think agree with Lesslie Newbigin... Do you?
‘How is it possible that the gospel should be credible, that people should come to believe that the power which has the last word in human affairs is represented by a man hanging on a cross?  I am suggesting that the only answer, the only hermeneutic of the gospel, is a congregation of men and women who believe it and live by it.  I am not… denying the importance of the many activities by which we seek to challenge public life with the gospel… But I am saying that these are all secondary, and that they have power to accomplish their purpose only as they are rooted in and lead back to a believing community.’

(Cited in Multiplying Churches Ed. Stephen Timmis)