In this pioneering book, the great thinker Mustafa Abdel Razek dealt with three topics that complement each other and are closely related to each other: religion, revelation, and Islam. The first is an investigation into the truth of religion in general, and the relationship between science and religion, and defining the concept of religion and explaining its origin in the eyes of research thinkers. The second is an explanation of an important phenomenon that accompanies most religions and upon which their origin depended, which is the phenomenon of revelation, in language, the Qur'an, and the Sunnah, and the most important theories in interpreting the phenomenon of revelation (the doctrines of theologians, the doctrine of Islamic philosophy, the opinion of Sufis, the doctrine of Ibn Khaldun, the opinions of Muslims in current times)... And the third topic of the book is an explanation of religion based on Revelation of a high example, which is Islam.