This is an essential book titled MENTAL BONDAGE IN THE NAME OF GOD, by an extremely talented author called Adid Safar (a Pseudo name leaving his real entity). It has set up a detail case for why Quran alone, detailing what conspiracy the Abbasid regime together with their Arab and Persian allies did against the Quran and the simple Deen that the Messenger in the Quran had established by naming that as the Believers Movement.