Christianity is the world's largest religion, based on the teachings of Jesus Christ. It began after Jesus' death in the 1st century AD and has since spread globally through missionary work. Jesus Christ, born in Bethlehem around 2000 years ago, is believed by Christians to be the Son of God who was crucified and rose from the dead. Important Christian sites include Jerusalem, Bethlehem, Nazareth, Rome and Canterbury. Major festivals celebrated are Easter and Christmas.