St Thomas Aquinas, as he is know to Catholics was probably the greatest theologian in the history of the Church (with the possible exception of St Augustine).
In 1265 AD he wrote De rationibus fidei contra Saracenos, Graecos et Armenos ad Cantorem Antiochenum. Aquinas demonstrates a familiarity with some Muslim (‘Saracen’) objections to Christianity – Trinity, Incarnation, Crucifixion, Atonement and Transubstantiation – which still have a very modern ring.
‘Truly the Saracens deride us because we say Christ is the Son of God, when God had no wife; and they consider us madmen because we confess three persons in God, yet do not profess three gods. Also they deride our saying that Christ, the Son of God, was crucified for the salvation of mankind, because if God is omnipotent, He could save mankind without the passion of His Son, and He could fashion man so he could not sin. Again they blame the Christians because they eat their God on the altar, and because the body of Christ, even if it were so large as a mountain, ought by now to be consumed.’