Christianity is an important world religion that stems from the life, teachings, and death of Jesus. Roman Catholicism is the largest of the three major branches of Christianity. Thus, all Roman Catholics are Christian, but not all Christians are Roman Catholic. Of the estimated 2.3 billion Christians in the world, about 1.3 billion of them are Roman Catholics. Broadly, Roman Catholicism differs from other Christian churches and denominations in its beliefs about the sacraments, the roles of the Bible and tradition, the importance of the Virgin Mary and the saints, and the papacy.
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