@Indignation
Luxenberg also argues that the Quran is based on earlier texts, namely Syriac lectionaries used in Christian churches of Syria, and that it was the work of several generations who adapted these texts into the Quran as known today.
https://en.wikipedia.org/wiki/The_Syro-Aramaic_Reading_of_the_Koran
Oversimplificiation
Cyril of Alexander punished Nestor for claims like that God has no biological mother and so Mary should not be called Theotokos
Islam spread in regions which had this controversy