Keith Schwanz, Libby Tedder Hugus, and Jason Veach are the co-authors of "Marks of the Missional Church: Ecclesial Practices for the Sake of the World." Evidence suggests that the Christian church has entered a historic transition in its relationship to the broader culture. In what some call post-Christendom, the church no longer holds an advantaged position in many places. Some Christians lament this development. Others believe that the disruptive change provides an opportunity for the churchâ??s renovation.