Christianity has been around since the beginning, the main belief of the religion is that God sent his son, Jesus Christ to die on the cross and save us from our sins. There are 2,100,000,000 world wide and number is decreasing Christianity has Jewish roots, the Old Testament is the Hebrew bible but they decided to call it the Old Testament, it is about life before Jesus, but it hints that Jesus is coming. The New Testament is the second part of the bible, this consists of the life after Jesus arrived and after his life. Christians gather every Sunday to praise and worship God they gather in a church and a pastor/ reverend teach about God and the Bible (book where they get all of there information) .