Perhaps we should review the entire history of Christianity -- Something enabled Christianity to spread from a small Jewish sect to become the major faith and power in the Empire -- and then Something caused Christianity to falter in areas where it had once been dominant, and then to fade away entirely in spots.  What failed?  Who failed?  How is that faltering now happening in the world?  And how can/should it be responded to? 

Is it important to be dominant, or is it important to demonstrate Christ in and to the world?