There is no proof for its divinity.
Mathematical analysis of the text shows it is the work of at least 30 different authors (possibly even as much as 100).
Stylistic elements, political context, evoked topics show the text was written during a period of more than 200 years.
See the work of Walter Jean-Jacques, Le Coran r?v?l? par la Th?orie des Codes, ?ditions de Paris, juillet 2014
Even the Quranic text speaks for itself concerning its divinity.
(2849) Sahih International Say, "Then bring a scripture from Allah which is more guiding than either of them that I may follow it, if you should be truthful."
This is not speaking about one book, cause it uses "either of them". It is referring to at-tawra wa l-inj?l, the Torah and Injil. Not the Quran.
Add to this the Quranic "satanic" verses. If Quran is divine polytheism is alright coz God says so and thus being self-contradicting?
Have ye thought upon Al-Lat and Al-?Uzz?
and Mant, the third, the other?
These are the exalted gharniq, whose intercession is hoped for.
Then look at the content which show a very limited understanding of biology and the universe (attributing thought to the human heart, fixed stars, flat earth,...). Look at the fiction in Quran which recounts the fable of Alexander building a gate against Gog and Magog.
People still believing this text has divine origin in 2017? Lul. The inimitability of Quran was already disputed by arabs of the 8th century. (See Rippin Andrew, Muslims, Vol.1, London /New York, Routledge, 1990, p.26-27.41. and Urvoy Dominique, Les penseurs libres dans l?Islam classique, Paris, albin Michel, 1996, p.55-58.)