What is the explanation of the two unique characteristics of Islamic culture: divine [origin] and comprehensiveness?

The Holy Quran is the primary source of Islamic culture, and it is the only divine book that has not been distorted, in accordance with His (Allah's) saying, "Indeed, it is We who sent down the Dhikr (the Quran) and indeed, We will be its guardian." Among the most prominent characteristics of Islamic culture is its comprehensiveness of all aspects of life and its suitability for all times and peoples, as it fulfills the needs of the human soul and regulates relationships and dealings among people. Islamic culture is divine in origin and comprehensive.