Abū Qurrah was among the earliest Christian authors to use Arabic alongside
Abu-Ra'itah of Tikrit,
Ammar al-Basri and
Abdulmasih al-Kindi. His works were referenced and reused by other Arab Christian writers such as the eleventh century bishop
Sulayman al-Ghazzi. He wrote thirty treatises in
Syriac, but none of these have yet been identified. His writings provide an important witness to Christian thought in the early Islamic world. A number of them were edited with German translations by
Georg Graf and have now been translated into English by John C. Lamoreaux. Abū Qurrah argued for the rightness of his faith against the habitual challenges of
Islam,
Judaism and those Christians who did not accept the doctrinal formulations of the Council of
Chalcedon, and in doing so rearticulated traditional Christian teachings at times using the language and concepts of
Islamic theologians: he has been described by Sidney H. Griffith as a Christian
mutakallim. He attracted the attention of at least one Muslim
Mu'tazilite mutakallim, Isa ibn Sabih al-Murdar (died 840), who is recorded (by the biobibliographical writer,
Ibn al-Nadim, who died in 995) as having written a refutation of Abū Qurrah. The subjects covered were, in the main, the doctrine of the
Trinity, the
Incarnation, and the
Sacraments, as well as the practices of facing east in prayer (rather than towards
Jerusalem or
Mecca), and the veneration of the cross and other images. In Abū Qurrah's
Questions of Priest Musa, in the course of its first two discourses ("On the Existence of God and the True Religion") ==Published works==