Today, Christianity is the world's largest religion, but it was once the faith of just a few devoted followers. The story of its growth is one of the most astonishing in history. Our timeline and animated globe charts the spread of Christianity across the world, from the crucifixion of Christ to the present day, including all the major conversions, missions, conquests and schisms. Join us as we explore how a small, Judaic sect became the word's most popular religion over the course of 2,000 years.