Christianity, Islam and Jud aism belong to the Abrahamic family. They have a lot in common as well as some d ifferences. All three religions have their scriptures. Christians have the Bible, which contains the Jewish scriptures in ad d ition to the twenty-seven books of the New Testament. The Quran is the sacred book of Muslims. Jewish scriptures are ground ed in Torah, the first five books of the Hebrew Bible. Christianity, Islam and Jud aism are monotheistic religions. Christians believe that the one God has an internal relationship of three persons, Father, Son, and Holy Spirit. The found ation and core of Islam is Allah, the one and only God . Jewish people associate reality with a d ivine image of God . There are some d ifferences in the und erstand ing of the human nature. Christianity teaches that human beings were created good by God . People are prone to sin and in need of grace, but they are partners in accomplishing God 's plan for existence. Islam teaches that the purpose of existence is to love and serve God through loving and serving others. For Jews, human nature is rooted in the d ivine image