Quran: who wrote it?

The fact he that he could not write any language, he did not spend time which Christan's or Jews as friends. Also the fact that the storeis about the Prophets in the Quran contain different details like the answer to why Joseph/Yusufs brothers why jealsous, its not in the bible but in the Quran.

The quran describes how the day turning into the light but a slow process, heres more.

O mankind! if ye have a doubt about the Resurrection, (consider) that We created you out of dust, then out of sperm, then out of a leech-like clot, then out of a morsel of flesh, partly formed and partly unformed, in order that We may manifest (our power) to you; and We cause whom We will to rest in the wombs for an appointed term, then do We bring you out as babes, then (foster you) that ye may reach your age of full strength; and some of you are called to die, and some are sent back to the feeblest old age, so that they know nothing after having known (much), and (further), thou seest the earth barren and lifeless, but when We pour down rain on it, it is stirred (to life), it swells, and it puts forth every kind of beautiful growth (in pairs).
( سورة الحج , Al-Hajj, Chapter #22, Verse #5)

Then We made the sperm into a clot of congealed blood; then of that clot We made a (foetus) lump; then we made out of that lump bones and clothed the bones with flesh; then we developed out of it another creature. So blessed be Allah, the best to create!
( سورة المؤمنون , Al-Mumenoon, Chapter #23, Verse #14)

Theres a book called 200+ ways that the Quran corrects the bible. It has been protected over the years and its in the same language as it was revealed.