With an approximately 1.7 billion people world wide, Christianity is arguably the largest religion in the world today. Started at around 30 AD, Christianity is based on the teachings and life of Jesus Christ. Christianity was founded in the first century in Palestine by the disciples of Jesus. Many missionaries spread it, despite heavy persecution, throughout the Roman Empire. Perhaps the most notable missionary was Paul. The various books written by Jesus’ followers after his death, called the New Testament, along with the Old Testament makes up the Christian Bible. The Bible holds all the teachings of Jesus on how all Christians should live out their lives.