I think the phrase like "the Quran that is the literal words of Allah ( The God alone)" is often the source of conflict, because it is both true and false. It is true for what I believe in Islam. It is false because whoever says this often means differently. They often mean that what they read or understand from Quran is the literal words of Allah. After all, Quran is not gibberish to them or written in Chinese with all the funny characters. Even when you read Quran, you don't just try to mesmerize the letters. You try to understand it and that understanding forms what you think Quran is, which is influenced by all other information collected via senses and is, unfortunately, NOT the words of Allah. One reason Kant thinks human beings are incapable of perceiving the ultimate truth.
Then whose understanding of Quran is the words of Allah? I believe, in the logical sense, only the understanding of the two is. One is Mohammad who actually said those words. The other, the less reliable one, is the one whom He was speaking to and whom He intended to communicate with. That is why all the written records of Saints are often misinterpreted and they are often taken out of the context of the communication that actually took place, which is almost always impossible to know exactly. Just like one brilliant doctor who told one patient to drink more water and another patient to drink less. When his words were written down and treated as eternally correct in all circumstances, people are confused. One could pick the first one since it is beneficial to them and if he happens to follow the second one, diarrhea occurs. He then claims whoever picks the second one Kafir who is the one responsible for his diarrhea.
For a Muslim it is... and the source of conflict is actually not the Quran... But Hadiths.
The Quran speak by itself... It's like a First person speaker recording his own words...
With the likes of ''Oh Muhammed, say, That We... '' That's why the Book is labeled as such.
Before, something is labeled as false... you have to prove it to be false... and in a very scientifically manner, the Quran respect it... It's the only religious book where it is asked, to falsify it... recreate something similar with the same effect and so on... that is How modern SCIENCE is done... and how our theories are accepted...
Kant is not the right exemple for this imo... after all ...he is a destructive ideologue... not gonna get into his personal life and ideas... where he himself was unable to perceive his own destruction...
Hadiths are not just some ''Tales'' said by X and heard by Y few hundreds years after... Hadith and the Quran follow a very meticulous method of restitution... that NO document/Book in our Human history ever had and preserved to this day... Every word/saying GOT HIS OWN chain of narration, meaning from the one saying it, to the one writing it... everyone on the individuals present in that chain, is know at the perfection... in his speech, biography,family,location etc...
I can write on it for ages... but you can read about the Islamic chain of narration of the Hadith and Quran used by Islamic scholars, like Bukhari or Muslims... you will be amazed by the work done... that even to this day... academics don't follow...
And even after that Hadith are categorized by Truthworthy, to not really...
And to sustain such claim, like the Quran... Islam is also the only Abrahamic religion to Have an original from Day one... Christians don't, neither the jews...
Many believe that Islam books came later on.. or were written later on... no it didn't... From the moment Muhammed (saw) recited those words... they were immediately written down... verified by him and accepted by him.