And, just to be clear, most scholars of the Quran regard it as being divinely inspired, but I doubt that is enough "scholarly authority" to convince you of its divine authorship!
But, you act like the early Church(es) unanimously considered the Gospel of Matthew to be divinely inspired, and again, such was not how the New Testament came to be:
Wikipedia -- Development of the New Testament canon
But, you act like the early Church(es) unanimously considered the Gospel of Matthew to be divinely inspired, and again, such was not how the New Testament came to be:
Wikipedia -- Development of the New Testament canon