http://www.pewforum.org/2011/12/19/global-christianity-exec/

"About one in every four Christians lives in sub-Saharan Africa (24%), and about one-in-eight is found in Asia and the Pacific (13%)."

"Christianity has grown enormously in sub-Saharan Africa and the Asia-Pacific region, where there were relatively few Christians at the beginning of the 20th century. The share of the population that is Christian in sub-Saharan Africa climbed from 9% in 1910 to 63% in 2010, while in the Asia-Pacific region it rose from 3% to 7%. Christianity today – unlike a century ago – is truly a global faith."