The historic time span of Christianity concerns the Christian religion, Christendom, and the Church with its various denominations, from the 1st century to the present.
Roman Catholic and Eastern Orthodox Christianity spread to all of Europe in the Middle Ages.
Since the Renaissance era, Christianity has expanded throughout the world and become the world's largest religion.
Today, Christianity is the most widely practiced religion in the world, with more than 2 billion followers.
The Christian faith centers on beliefs regarding the birth, life, death and resurrection of Jesus Christ.
While it started with a small group of adherents, many historians regard the spread and adoption of Christianity throughout the world as one of the most successful spiritual missions in human history.