Introduction Historical, political and religious factors occasioned to a vast interfaith polemical literature between Muslims and Christians. Along history, there had been many such polemical responses, in which the respective writers exerted to rebut the opponents' doctrines and prove their own. The crusaders and their political existence in the holy land and elsewhere, and their collusion with the Tatars against the Muslims at some epochs of history induced many antipathetic reactions that ranged from military to academic. Besides, the Islamic duty of defending and propagating Islam imposed and provoked the responses of many Muslim scholars. Among the very prominent responses is that which Ibn Taymiyyah, who lived in the thirteenth and fourteenth century, launched. Ibn Taymiyyah wrote prolifically almost about every subject of religious import. Regarding refuting Christianity, apart from the small tracts and chapters in different books, he wrote a voluminous book challenging their assertions against Islam and disproving Christian allegations and doctrines. Significance of the Study This is an attempt to carry out a critical study of Ibn Taymiyyah's response to Christianity. This response was triggered by a letter Ibn Taymiyyah received from Paul of Antioch, the bishop of Sidon See. Ibn Taymiyyah who was always keen to counter attack any innovation in religion from within the Muslim community could not have condoned this daring transgression in which the necessity of Islam as the only valid means for salvation is challenged. He, therefore, ventured to write a long, cogent response where (as usual) he utilized his unmatchable polemical power to keep the Muslim's theology in its pristine shape. Ibn Taymiyyah mentions at the introducing pages the main points that were claimed by the Christian bishop in the letter. They can be reiterated thus: ¿ That Muhammad (peace and blessings of Allah be upon him) was not sent to the Christians. Rather, he was sent exclusively to the pagan Arabs and the Quran testifies to this. ¿ Muhammad (peace and blessings of Allah be upon him) spoke highly about their religion in the Quran,