2019년 지구상에서 가장 많은 비율을 가지고 있는 종교는 무엇인가?
According to 2011 Pew Research Center survey, there are 2.2 billion Christians around the world in 2010, up from about 600 million in 1910. And according to 2012 Pew Research Center survey, within the next four decades, Christians will remain the world's largest religion; if current trends continue, by 2050 the number of Christians will reach 2.9 billion (or 31.4%). 
By 2050, the Christian population is expected to exceed 3 billion. Christians have 2.7 children per woman, which is above replacement level (2.1). According to Pew Research Center study, by 2050 the number of Christians in absolute number is expected to grow to more than double in the next few decades, from 517 million to 1.1 billion in Sub Saharan Africa, from 531 million to 665 million in Latin America and Caribbean, from 287 million to 381 million in Asia, and from 266 million to 287 million in North America.
Christian