I'm lazy, I answered first by memory and then checked facts in wiki
Muhammed was illiterate and did not write the Quran. It, like the bible, was all oral tradition.
The Kur'an was not
an oral tradition; it was written down as Mohammed recited it. I don't know if there was an Arab tradition of memorizing prior to that but certainly people do memorize and recite the koran.
The kur'an was complied into one by by Abu Bakr apparently.
As for the bible, it was an oral tradition or parts of it were. (The New Testament was not one tho; it was a fragment of writings and of letters, copied over the years as Christians struggle not to be burned, eaten by lions or otherwised executed by Nero's friends)
It is a really long epic prose poem in classical Arabic that, yes, nobody speaks today.
It was 114 suras to be precise. Each of which would be a poem.
God revealed his word in Arabic to Big Momo, who then recited it to other people, starting with his long-suffering first wife. During his lifetime scholars began record it in written form.
Unsure what his wife felt about him; it is not recorded. She wasn't the only one writting down what he said.
As I understand it, he spoke, somebody wrote it down.
Abu Bakr apparently compiled them into a book.
Within a few decades there were many competing versions of the Quran and one caliph decided on the definitive version, kinda like the King James bible.
This is news to me.
Probably because the bible was such an incoherent mess, the Quranic scholars made sure to clean up as many of the contradictions as they could, making the Quran a more consistent work. Well, consistent, that is, for a completely mythical confabulation based on the visions of a charismatic guy who spent too much time out in the desert sun.....
You don't seem to believe that Allah is the one true God or that Mohammad was his prophet. I'm going to guess that you eat pork and drink alcohol.