How do Islam and the Quran look without divinity?

Part III:

How do Islam and the Quran look without divinity?

Let us consider how Muhammad received the revelation from an Islamic point of view. 

The oldest surviving biography of Muhammad is that of Ibn Hisham (died 833 CE). In this biography, According to Ibn Hisham, before the revelation of the Quran, Muhammad used to visit a cave in the mountain called Hira in Mecca for a month every year. When Muhammad was finished with his seclusion in the mountain, he would return to circumbulate the Kaba seven times before heading home. In 610 CE, as in the years before, Muhammad visited Hira. This time, Muhammad claimed that he was visited by a stanger (later identified as Angel Gabriel).  According to Ibn Hisham, Gabriel appeared to Muhammad in his sleep, carrying a book. He commanded him to “read.” Muhammad refused twice the order before finally asking what he was supposed to read.  Muhammad went home in shock and spent the following few weeks in shivers and fears. His wife, Khadija, sought the help of Waraka, a relative and Christian priest, who immediately diagnosed the condition as a sign that Muhammad was going to be a prophet. Khadija agreed with that diagnosis. A few weeks after this incident, Muhammad made the claim to be a prophet and started his campaign to convert the Arabs, and the world, to his religion. 

Devout Muslims believe that the stranger who appeared before Muhammad was indeed the Angel Gabriel and that the Quran, that was communicated to humanity through the otherwise illiterate Muhammad , is the world of Allah.

If we strip divinity off this story, what do Muslims have to show for Muhammad's experience in the cave?  What about the contents of the Quran?  Without divine origin, what is the source of Quran?  Of what value are Quran's claims?  What do we make of violent attacks of Muhammad on idol worshippers of his time and destruction of idols?  What do we make of all the religious wars waged by Muhammad, destruction and looting that followed in the name of Allah's cause? What do we make of all the Muslims in independent India who bow in the direction of Mecca in Saudi Arabia?

Stripped of divinity, Muhammad's story would turn into one of mass deception, intolerance to believers of other deities, and waging wars by imposing fear of Allah.  Quran would turn into a dictionary of banal statements.  It is an ridiculous presupposition for a Muslim to agree with in order to enter a discussion with a "scholar".  It is a heartless act of torture to make a Muslim accept that Muhammad is not a prophet and Allah is not the God.  Indeed, that is what a secular "scholar" would presuppose, but to ask a Muslim to contemplate on that presupposition and participate in a "scholarly" debate?  Removing divinity alters everything about the story, reducing it to a farce.  If such an idea is forced on Muslims, that would be tantamount to tampering with his freedom on conscience.  No free-thinking Muslim will engage in a "scholarly discussion" of Muhammad's history or the Quran with the presupposition of removing all divinity involved in delivery of Quran to humanity.  

Similarly, no free-thinking Hindu should accept the presupposition thrust upon Hindus that all divinity be stripped from a Maha Kavya (Ramayana, Mahabharata for example) in order to have a "scholarly discussion" of it.