This is one interesting argument (out of so many existing arguments) that the Qur’an was not written by Muhammad s.a.w :-
Specific passages of the Holy Qur’an were revealed at the same time as the events that happened during the Prophet’s time. Passages were revealed bit by bit throughout the 23 years of his prophethood. The purpose was to guide the early Muslims. Those were practical lessons for them. The passages described each event. This is not particularly surprising. What is extraordinary to note, however, is what not being said in the Qur’an.
Anybody who reads the Qur’an for the first time may be struck not only by what the revelation contains but also by that which is absent. For example, the Prophet Muhammad s.a.w outlived his first love and first wife, the woman with whom he spent twenty-five years of his youth, Khadijah. She died after two long painful years during which the Makkan pagans persecuted and starved Prophet Muhammad and his followers. Twenty-five years of love, support, caring, and kindness – gone. His first wife, so beloved that he remained faithful to her throughout their marriage and throughout his youth – gone. The first person to believe in his Prophethood, the wife who bore 8 of his children – gone. So devoted was she that she exhausted her wealth and sacrificed her tribal relationships in support of him. After which, she was gone.
Well, if the Qur’an was composed and written by Muhammad, where this was supposed to be his greatest literature and be his legacy for generations, surely he would be mentioning his loved ones in it.
Musicians croon over their lost loves; artists immortalise their infatuations in marble and on canvas, photographers fill albums with glossy memorials and poets pour their hearts onto paper with the ink of liquid lamentation. Yet despite what a person might expect, nowhere does the Qur’an mention the name Khadijah. Not once. The wives of Pharaoh, Noah, and Lot are alluded to, but Khadijah is not even given passing mention. Compounding the peculiarity is the startling fact that the only woman the Qur’an mentions by name is Mary, an Israelite and the mother of Jesus. And she is mentioned in glowing terms. As a matter of fact, a whole surah bears her name [surah 19 = Maryam].
Many orientalists claim that the Qur’an is not revelation but was the product of the Prophet Muhammad’s mind. One could question if this could be the product of the mind of a man when he excluded the women who filled his life and memory from the revelation he claimed, in favor of an Israelite woman and the mother of an Israelite prophet, this drives recklessly against the flow of reasonable human emotions and expectation.
During the Prophet Muhammad’s life, he saw every one of his four sons die. All but one (Fatimah) of his four daughters pre-deceased him. His favored beloved uncle, Hamzah, was killed in battle and mutilated in a horrific manner. The Prophet Muhammad and his followers were regularly insulted, humiliated, beaten, and on occasion murdered. On one occasion the offal of a slaughtered camel was dumped on the Prophet’s back while he was prostrate in prayer. The sheer weight of this offal reportedly pinned him to the ground until his daughter uncovered him. Camels smell bad enough while they’re living. Imagine the smell and texture of their decomposing guts while the Prophet s.a.w was buried in the tangled mass of slimy offense and rotting camel juice running down his arms, cheeks and ears. Such painful events must have tortured Prophet Muhammad’s memory. A normal person who wrote a book to immortalize his legacy will surely include those painful events. Yet they are described nowhere in the Qur’an.
So the Qur’an is remarkable in that its content does not reflect the mind of the Messenger. Why? Because he is not the author of the Qur’an.
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أَفَلَا يَتَدَبَّرُونَ ٱلۡقُرۡءَانَۚ وَلَوۡ كَانَ مِنۡ عِندِ غَيۡرِ ٱللَّهِ لَوَجَدُواْ فِيهِ ٱخۡتِلَـٰفً۬ا ڪَثِيرً۬ا
Then do they not reflect upon the Qur’an? If it had been from [any] other than Allah , they would have found within it much contradiction.
(Surah An-Nisa – 4:82)