2. The Births of Muhammad and of Christ
It is common knowledge that the father of Muhammad was a man by the name of Abdallah; and his mother a woman named Amina. Muhammad was a man born of an acknowledged father and a respected mother. Neither the Qur'an nor Muslim scholars claim that Muhammad was born in a supernatural way. His birth was not announced by an angel, nor was he born by the Word of God. He was born in a natural way as we all are, from a human father and a human mother.
As for Christ, the Qur'an states several times that He was not born in the normal way, as we all are. His Father was not a human being. He was conceived in the Virgin Mary without the interference of a human father, for Allah breathed His Spirit into her. This makes Christ -- exclusively -- the only one in the whole world who was born of the Word of God and His Spirit.
“Truly, Christ, Isa, the Son of Mary, is a messenger of Allah and His Word, which He bestowed unto Mary, and Spirit from Him.” (Sura al-Nisa' 4:171)
إِنَّمَا الْمَسِيح عِيسَى ابْن مَرْيَم رَسُول اللَّه وَكَلِمَتُه أَلْقَاهَا إِلَى مَرْيَم وَرُوح مِنْهُ (سُورَة النِّسَاء ٤ : ١٧١)
“Then We breathed into her of Our Spirit.” (Sura al-Anbiya' 21:91)
فَنَفَخْنَا فِيهَا مِن رُوحِنَا (سُورَة الأَنْبِيَاء ٢١ : ٩١)
“Then We breathed in Him of Our Spirit.” (Sura al-Tahrim 66:12)
فَنَفَخْنَا فِيه مِن رُوحِنَا (سُورَة التَّحْرِيم ٦٦ : ١٢)
Christ is not a usual man, but the divine Spirit incarnated in human flesh. Thus, He was born of the Spirit of God and the Virgin Mary. In contrast, Muhammad was born of a father and a mother, like all humans. He was not born of the Spirit of God.