How many Christians are in the world?
Christianity by country
According to Christian Today, there were 2.4 billion Christians around the world in 2015. And according to a 2012 Pew Research Center survey, if current trends continue, Christianity will remain the world's largest religion by year 2050. By 2050, the Christian population is expected to exceed 3 billion. Many charismatic movements are growing in Africa, Latin America, Muslim world, and Asia.Other religions:
Protestantism
Protestantism is the second largest form of Christianity with collectively between 800 million and more than 900 million adherents worldwide or nearly 40% of all Christians. It originated with the 16th century Reformation, a movement against what its followers perceived to be errors in the Roman Catholic Church. Ever since, Protestants reject the Roman Catholic doctrine of papal supremacy and sacraments, but disagree among themselves regarding the real presence of Christ in the Eucharist. They emphasize the priesthood of all believers, justification by faith alone (') rather than by good works, and the highest authority of the Bible alone (rather than with sacred tradition) in faith and morals ('). The "five solae" summarise basic theological differences in opposition to the Roman Catholic Church.