Thomas Daniel Nehrer said this quote

For deep adherents, the Koran would seem to echo great truths given directly to a vaunted and hallowed prophet by a deity of overwhelming power and grandeur. If you don’t hold any such archaic notions, however, the words attributed to Allah come across as harshly self-defensive, crude in reemphasizing old cultural standards, shaky in trying to establish new standards, brutal in places, mostly repetitious and monotonous – and thoroughly unbelievable. When you have outgrown all such unfounded religious notions, the Koran doesn’t offer much by way of piercing perspective.