Depending on how far the church wants to emerge, we might find another valuable guide in Ken Wilber to add to the traditional list (Borg, Spong, etc.). Below is a brief intro to his work.

1 Corinthians 9: 16 -23        Witnessing                           Feb. 8 , 2009
Mark 1: 29 -39

What does it mean to witness?  Paul lays out his mission to preach the Kingdom of God. In the passage from Mark,  we read of the beginning of Jesus mission to preach the kingdom of God.   Paul speaks of an obligation to preach the Kingdom.  Jesus creates a community to witness to the Kingdom.