Christianity, a monotheistic religion centered on Jesus Christ, believes in one God existing as the Holy Trinity. Its core tenets include Jesus' divinity, his death and resurrection for salvation, and the concepts of sin and eternal life. Christianity originated in the 1st century CE, spreading from Jesus' teachings to become a global faith. The Bible, divided into Old and New Testaments, serves as its sacred text. Various denominations have emerged, each with distinct practices and interpretations.