Thanks to the “global south”, it is why the Christian has been having it largest growth.
While still a relatively small fraction of the population, the number of Christians in Asia has grown significantly in the 20th century, outpacing Asia's rapid population growth. According to the World Christian Database, the number of Christians in Asia increased from approximately 22 million adherents in 1900 to 101 million in 1970. Today, according to these estimates, Christians comprise 9% of the continent's population, or nearly 351 million people. Protestants, including Anglicans and independents, made up 0.5% of Asia's population in 1900, but grew to 6% by 2005. Some experts believe that the World Christian Database estimates for Christian and Protestant adherence in Asia may be too high, due to overestimates in China, India and Indonesia (Jenkins 2001: 223-224; Hsu, et al. 2006: 22-23). But even if these estimates were reduced by half, they would still yield a Protestant population of more than 100 million.