Sorry to be so late. For some reason this didn’t show in my email as it had been doing before.
Anyway, it is easy. The Muslims do not understand that Jesus did not write anything in Scripture. They think we are like the Protestants and go by Scripture alone. We don’t.
Explain to him that Jesus established the Church by His own word.
Matthew 16:18 And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it. 19 And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.
He commanded the Church to teach His commands:
19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: 20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen.
It is this Church which teaches the Wisdom of God infallibly and will continue to do so throughout time:
10 To the intent that now unto the principalities and powers in heavenly places might be known by the church the manifold wisdom of God,
In summary, the Traditions of Jesus Christ, which are taught by the Church are the basis of the New Testament. If someone does not know the Traditions of Jesus Christ, they will not understand the New Testament. Therefore when he says:
*** he wants to see a basis for it in Christ’s teachings.***
Tell him that in order to do so he must study the Teachings of the Catholic Church in addition to the Bible. Because it is in the Teachings of the Catholic Church that the Traditions of Jesus Christ are revealed.
Then challenge him with the fact that Mohammed could not prove that he saw an angel. No one saw the angel but Mohammed and no matter how many fits he threw, the only thing that anyone ever witnessed were his fits. Therefore all that they could attest to is the probability that he was epileptic. But no one ever saw what he claimed to see.
(Aside: Don’t mention this to him, but be aware that there is a sura which says that someone saw a man whom another claimed was the angel. But the sura is poorly attested and besides, it doesn’t say that they saw the angel, but a man whom someone else said was an angel. Hardly evidence that would pass muster in any court.)
Further, challenge him with the fact that the Quran is not what Muslims claim it is. The Quran in the possession of the Muslims today is called the Uthmanic Rescenscion. What is that?
Well, it is the rewriting of the Quran by a man called Uthman who burned the original and replaced it with his version. You don’t believe me? Read it in their own words:
2. UTHMAN’S ORDER TO BURN THE OTHER CODICES.
About nineteen years after the death of Muhammad, when Uthman had succeeded Abu Bakr and Umar as the third Caliph of Islam, a major new development took place in the standardising of the Qur’an text. The Muslim general Hudhayfah ibn al-Yaman led an expedition into northern Syria, drawing his troops partly from Syria and partly from Iraq. It was not long before disputes arose between them as to the correct reading of the Qur’an. They had come from Damascus and Hems, from Kufa and Basra, and in each centre the local Muslims had their own codex of the Qur’an. The codex of Abdullah ibn Mas’ud became the standard text for the Muslims at Kufa in Iraq while the codex of Ubayy ibn Ka’b became revered in Syria. Hudhayfah was disturbed at this and, after consulting Salid ibn al-As, he reported the matter to Uthman. What followed is described in the following hadith:
Hudhaifa was afraid of their (the people of Sha’m and Iraq) differences in the recitation of the Qur’an, so he said to Uthman, ‘O Chief of the Believers! Save this nation before they differ about the Book (Qur’an) as Jews and the Christians did before’. So Uthman sent a message to Hafsa, saying, ‘Send us the manuscripts of the Qur’an so that we may compile the Qur’anic materials in perfect copies and return the manuscripts to you’. Hafsa sent It to Uthman. Uthman then ordered Zaid ibn Thabit, Abdullah bin az-Zubair, Sa’id bin al-As, and Abdur-Rahman bin Harith bin Hisham to rewrite the manuscripts in perfect copies. Uthman said to the three Quraishi men, ‘In case you disagree with Zaid bin Thabit on any point in the Qur’an, then write it in the dialect of the Quraish as the Qur’an was revealed in their tongue’. They did so, and when they had written many copies, Uthman returned the original manuscripts to Hafsa. Uthman sent to every Muslim province one copy of what they had copied, and ordered that all the other Qur’anic materials, whether written in fragmentary manuscripts or whole copies, be burnt. (Sahih al-Bukhari, Vol. 6, p.479).
They justify this course of action with the idea that they were protecting the Quran from perversion. A fate they claim the Bible suffered. But the fact is, that they have simply prevented everyone from seeing the horrendous quality of the original which Mohammed, the purported Prophet of God, had left behind. In other words, a man who never spoke to an angel nor was ever mentioned by God, claimed to take the Prophets works and burn them and then replaced them with his own work.
This seems more like a scheme to hide the truth than a plan to promote the truth.
I hope that helps. My email is email@example.com. If I don’t reply to your inquiries fast enough, feel free to send them directly to that address.