What do Christians believe?

While Christianity 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.

Catholicism is the largest branch of Christianity, with an estimated 1.285 billion followers. This overview surveys Catholic worship, holy texts, and core beliefs, along with the role and history of the clergy and the church's political attitudes over time.

Eastern Orthodoxy are one of the oldest religions in the world. There are around 270 million people that follow the Orthodox tradition. It’s followers live mainly in the Balkans, the Middle East, and former Soviet countries.

There are approximately 1 billion Protestant adherents worldwide or about 37% of all Christians. A Protestant is an adherent of any Christian bodies that separated from the Church of Rome during the Reformation, or of any group descended from them.

The Church of Jesus Christ of Latter-day Saints—often called the Mormon church—has over 16 million members. This overview surveys LDS worship, holy texts, and core beliefs, along with their church officers, their history and split from other denominations, and their attitudes to equality.

Quakers number around 210,000 worldwide, and not all regard themselves as Christian. This overview surveys Quaker worship, holy texts, and core beliefs, along with their approach to clergy, their history and schisms, and their politics and attitudes to equality.

This position surveys the beliefs of Amish Christians, an American Protestant group of around 200,000 members. It outlines their history and schisms, their distinctive worship and clergy, their attitudes to politics and equality, and the plain, separated way of life their faith prescribes.