All believedAbrahamwas their original anchor. Another important similarity between the three monotheistic religions is that their sacred scriptures are believed to have originated from the same sources. Lastly, the three religions believe in the existence of a single God.
The major differences between the contents of the Quran, the New Testament and the Bible. Judaism is based on race, whereas Christianity and Islam are based on choice. Islam developed through Abraham's son, Ishmael and the Arabs.