The Bible? How the ancient Jewish people saw their world, from their creation myths to their establishment of monotheism and their firm belief they were the 'chosen' people. They believed that their God would deliver them from slavery in ancient Egypt and many of the figures of the Old Testament illustrate tales of fidelity to the one true God.
The Jewish law for observance and behaviour was set down in Deuteronomy and Leviticus as well as beautiful mystical texts in some of the books.
The life and teachings of Jewish man Jesus of Nazareth is recorded in the New Testament which was seen by Christians as a fulfillment of the promises of the old testament prophets and a fulfillment of the Jewish belief in a saviour from the Romans.
Instead of delivering the Jewish people from subjection by the Romans, Jesus offered a spiritual freedom, his teachings eventually getting him into hot water with the Jewish leaders and the Roman establishment.
Jesus' crucifixion then becoming a central event and his alleged resurrection by the early Christians
40 or so years after Jesus' death a strict Pharisee named Saul had a mystical vision of Jesus, whom he never met unlike the other disciples and subsequently established Christianity travelling across Greece and the ancient world, fusing Greek mysticsm with the belief that Jesus was the son of the Jewish God and becoming Paul.
I'm not too keen on John and the book of Revelations though, it being antisemitic and very extreme.