In our secular and/or religiously plural society, it can no longer be assumed that the images, practices, and vocabulary of Christianity will come naturally, that they will automatically make sense to the average person. In such a world the intentional and disciplined thinking of the faith–theology–is essential in order to shape, equip, and empower missional communities. In other words, churches living into a missional identity are saying “goodbye” to Christianity as good common sense, available to all without reflection, training, or change in attitude and lifestyle. And they are saying “hello” to theology as the work of the people, affirming that all Christians are to be engaged in the persistent and consistent exploration of the uncommon sense of Christianity.
From Take Time To Be Holy, by Inagrace T. Dietterich and Dale Ziemer