Christianity began in Judea, which was controlled by the Roman Empire. Jesus Christ was born in Judea and taught a new form of Judaism emphasizing God's love. He had twelve apostles as disciples. Some Jews believed Jesus was the messiah, but Roman authorities had him crucified. Christians believe Jesus resurrected three days later and forgave sins, allowing people to reach heaven. The apostles spread Christianity despite persecution, and it grew until becoming the Roman Empire's official religion under Constantine. Christianity then diversified into branches like Catholicism and Protestantism.