In 385 AH/AD 995 the Qāḍī 'Abd al-Jabbār, well known for his Mu'tazilī theological writings, wrote the Confirmation of the Proofs of Prophecy, a work that includes a creative polemic against Christianity. 'Abd al-Jabbār reinterprets the Bible, Church history (especially the lives of Paul and Constantine) and Christian practice to argue that Christians changed the Islamic religion of Jesus. The present work begins with an examination of the controversial theory that this polemic was borrowed from an unkown Judaeo-Christian group. The author argues that...