Islam.

The Qur'an is a very accurate representation of the dedication of the people of the Islamic religion to their deity. The Qur'an is the most important of books to these people. It is basically their bible, to give a similar comparison. The writings of the book are given from Allah (deity), and are supposed to be studied by the people and recited on a daily basis. If one was to study the teachings within it, the views of Islam express that that same person would grow much closer to Allah. It gives the people guidance and direction.
The writings within the text are very poetic and visually appealing as well. It is truly an artistically based spiritual text.