Christianity is a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. With approximately 2.4 billion adherents, it is the world's largest religion.
Christianity encompasses an extraordinary diversity of belief and practice, from Roman Catholicism and Eastern Orthodoxy to mainline Protestantism, Evangelical movements, Pentecostalism, and thousands of independent churches worldwide. Major theological questions — the nature of salvation, the authority of scripture, the role of tradition, and the structure of church leadership — have produced distinct denominations with significantly different practices and beliefs.
The tradition's central texts are the Old and New Testaments of the Bible, though different branches recognize different canons. Core beliefs typically include the divinity of Jesus, the Trinity, salvation through grace, and the resurrection. Practices range from elaborate liturgical worship to informal contemporary services, from monasticism to megachurch culture.