Jews, Christians, and Muslims supposedly share a common religious heritage in the patriarch Abraham, and the idea that he should serve only as a source of unity among the three traditions has become widespread in both scholarly and popular circles. But in , Jon Levenson reveals how the increasingly conventional notion of the three equally "Abrahamic" religions derives from a dangerous misunderstanding of key biblical and Quranic texts, fails to do full justice to any of the traditions, and is often biased against Judaism in subtle and pernicious ways.