One response to a Christian apologist could give to Muslims for why the Injeel has not been corrupted is a theological response.
When Muslims say the Injeel has bee corrupted, Fouad Masri, founder of Crescent Project, suggests saying, "Astaghfurallah"! This means, "God forbid."
Why should this response be given? It would appear that such a response is instantly setting up a fight, using the name of Allah and throwing it back in a Muslims face that he or she is WRONG! In fact, this is done from a loving position. Muslims say "God Forbid" whenever something is said or done that goes against Allah or his will. The idea is that Christians apologists should respond with "God Forbid" to direct them to the truth that what they just said went against God's word, because it suggests that humans are stronger than God.
From a theological study of the Qur'an, who is stronger, man or God? Clearly God. From a theological study of the Qur'an is the Injeel (NT), from Allah and his word? The answer is yes. It then stands to reason, if they were God’s words when they were written down, how could man have the power to change them? If man can corrupt God’s word, how do you know then if the Qu’ran can’t be corrupted. God will save and protect his word.
At this point a Christian can encourage a Muslim to know that in the Injeel God has promised to keep his word. Encourage a Muslim to read the Injeel. Copies of the New Testament can even be purchased which have the title "Injeel" on the cover and they are written in both Arabic and English. It would be the perfect time to share the Injeel with a Muslim, ensuring him or her that God's word cannot be corrupted, because God will preserve his word - man is not stronger than God.
Many Muslims have not read the Injeel, because they have always been told that it is corrupted! They are taught that it is corrupted because it clearly contradicts what the Qur'an teaches. Yet, the Qur'an says the Injeel is the word of Allah. Christians must begin to interact with Muslims to show them that the Qur'an mandates that the Injeel be kept and read and that it came before the Qur'an and God's word cannot be changed by men, since God is stronger than men and God has promised to keep his word. Once Muslims begin to read the Injeel, in the view that it is the word of God and can be trusted, they will learn what the Injeel's teachings about God and the prophets runs contrary to that of the Qur'an, and if they were in fact reading it as God's word that came before the Qur'an then in hope they will see the Qur'an for what it truly is, the word of a man.
Buy Copies of the New Testament Injeel
in English - Arabic (Click the Link Below):