Prof. Wall announced/confirmed the collapse of European Christendom in 1969. Also, the 1910 World Missionary Conference was realy not a "world" gathering - it was de facto a refresher gathering of European/American missionaries on furlough with absolutely no one from Africa, South America and one or two from Asia. World Christianity that emerged on the Day of Pentecost - which is far more than Euro-centric Roman Catholic and Reformed denominations - always forgets/excludes most of the ancient Christian traditions, esp. Orthodox heritage.