""That they all may be one"" was Jesus' first-century prayer. With mind and emotions set towards Golgotha, he poured out his heart to the Father. But what is our twenty-first-century reality? Local churches are siloed. Pastors do not know one another and rarely work together. Christians drive by church buildings on their way to Sunday worship and seldom pray for one another. Vitriolic disunity spews across social media in front of an onlooking world...