The suburbanization of American Christianity has had a huge impact on institutional and denominational structures. Automobile-shaped development has produced an automobile-shaped ecclesiology. The car has abolished the possibility of the parish. And that, in turn, has helped to redefine “neighbor” as a matter of preference more than of proximity — as optional rather than obligatory. That redefinition is rather significant, since “Who is my neighbor?” is kind of an important question for Christians.