formingMissio Dei is a post-Christendom approach to missiology, locating "sending" in the heart of God rather than in ecclesial strategy. In the Christendom era, ecclesiology preceded missiology as the institutional church took center stage and sought to extend its influence in various ways, some less consistent than others with its founding story and values. Post-Christendom requires and enables recovery of a more authentic approach to mission, one with a goal more comprehensive and inspiring than just enlarging the influence of the church, and one that adopts attitudes and methods more consistent with the ways of Jesus embodied and advanced the mission of God.

~ Jonathan Bonk from "Forming Christian Habits in Post-Christendom"