The Pentateuch and Historical Books of the Old Testament

Christianity as a religion bases its teachings on the Bible. Though there exists several Christian denominations, all of them use the same Bible which has 66 books (39 in the Old Testament and 27 in the New Testament). Regarding the Old Testament, there are some teachings which Christians do not follow because when Jesus Christ started his Ministry in about AD 27, he amended some of those laws and teachings. For example he rejected divorce, revenge, killing, the laws on foods, etc, contrary to what the Old Testament teaches. Christians follow what Jesus amended because they believe that Jesus was and is still God's son, the Messiah who was sent on earth to liberate mankind. They also believe that Jesus is God. Whereas people of other faiths such as Islam do not accept that, they are free to believe what they think is right.