How are islam judaism and christianity alike ?

in spite of there differences the three religions worship the same God

 What are called the Abrahamic religions are composed of Judaism, Christianity, and Islam. For the past few thousand years, the Abrahamic religions have always been in disagreement with each other. As a result, many individuals believe they are somewhat different, but between Judaism, Christianity, and Islam, there are actually many shared values. The value of prayer, festivals, charity, and cleanliness, and pilgrimage involves these shared values, rituals, and traditions.

Explanation: All Jews, Christians, and Muslims think that with Abraham, God made a covenant or agreement. This covenant guaranteed that believers would maintain faith in and worship God and that this worship tradition would continue for centuries. God will in exchange, protect Abraham's children, grandchildren, and great-grandchildren. This covenant became the legacy, or trust, for Abraham's children to continue. The most important part of Abraham’s story is his faith and obedience to God. The book of Genesis, which both Judaism and Christianity use, tells this story. God calls to Abraham, and he replies “Here I am.” Obedience to God very important in Islam as well. When Muslim pilgrims say “Labaik! Allahuma labaik!” as they approach the sanctuary at Mecca — which they believe Abraham built — they are repeating, “Here I am, Lord, at Your Command!” While the story is the same among the monotheistic traditions, the Bible and Quran interpret it slightly differently. The story in the Bible says that the son to be sacrificed was Isaac, while the Quran says it was Ishmael. The lesson of obedience and strength of faith, however, is the same.

must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"