A global leader in ecumenical movement has alerted participants to the forthcoming World Council of Churches 10th Assembly in Busan, to be aware that they meet in rapidly changing times for world Christianity.
He says there are consequences for all church institutions, including the WCC itself.
Rev. Wesley Granberg-Michaelson, in a book timed to coincide with the gathering, says so fundamental are the changes now shaping the Christian world that the WCC will need to "commit to deep change."
It they don't, he says, they could remain largely isolated from the dynamic and growing parts of the church, especially from the global South.
His perceptions are likely to strike a chord at when the World Council of Churches meets in Busan from Oct.30 to Nov. 8 for its 10th Assembly, the highest decision making body of the grouping that represents some 560 million Christians.
Granberg-Michaelson, is a former member of the main governing body of the WCC, its central committee, and worked on the staff of the organization for six years, originally as director of the Church and Society programme.
He says the book, From Times Square to Timbuktu, is an attempt to describe the "growing gulf" occurring in world Christianity, primarily between the burgeoning Pentecostal and evangelical churches in the global South and the declining churches of the global North.