There is a strong connection between Islamic doctrine and, as Julian Jaynes wrote about, the post-bicameral experience of the lost divine, of God/gods gone silent. As a much later religious development, Islam took this sense of loss to a further extreme in the theological claim that neither God nor the angels any longer speak to humans (Islam as Worship of a Missing God; & Islamic Voice-Hearing), and that silence will continue until the end of time.
The divine supposedly can only be known about indirectly, by way of dreams and other means. It also makes it a much more text-based religion, since Muhammad wrote down his visions there has been total divine silence. So, there is greater focus on the power of language and textual analysis, as the only hope we have of sensing the voice of God in life is by reading the words of prophets who did hear God or, in the case of Muhammad, heard the archangel Gabriel speak on behalf of God.
In a way, this makes Islam a more modern religion, much further distant from bicameral voice-hearing. It was founded, after all, more than a half millennium following the earlier monotheistic revival in the post-axial era of the first century. So, Islam could be seen as an attempt to come to terms with a world ever more dominated by Jaynesian consciousness.
Evidence of this could be seen with Islamic psychology, ilm al-nafs. In the West, psychology developed more separately from and independently of religion, specifically Christianity and Judaism. But in Islam, psychological study and mental health became central to the religion itself and developed early on. That is a telling difference, so it seems to me.
Here is a possible explanation. Unlike the other monotheistic religions, the divine mind and voice in Islam is so distant as to have no immediate contact with the human world. This forces humans to study their own minds more carefully, including dreams, to sense the influence of the divine like reading the currents of the ocean by watching the ripples on the surface. This makes psychology to be potentially all the more important to Islam.
The West, instead, has largely replaced religion with psychology. This was necessary as religion had not as fully adapted itself to the new psychological mindset that emerged from Jaynesian consciousness. This leaves an uneasy relationship between religion and psychology for Western culture, something that is maybe less of an issue within Islam.
Islam has a more complicated and nuanced relationship to voice-hearing. This maybe requires a more psychological approach. The Islamic individual has a greater responsibility in determining the sources of voices, as part of religious practice.
The Islamic tradition sees religion and psychology as being inseparable. The psychologist Carl Jung, having developed mutual respect with the Islamic scholar Henry Corbin, agreed with that view in stating to Sigmund Freud that “religion can only be replaced by religion” (quoted in Peter Kingsley’s Catafalque). Jung argued that, “We must read the Bible or we shall not understand psychology. Our psychology, our whole lives, our language and imagery, are built upon the Bible.”
There is no way to remove religion from psychology. And all that we’ve accomplished in the modern West is to turn psychology into its own religion.