Natural proof: it is an overview of the Universe from the Big Bang to the Doomsday, - the Six Days of Creation. It is a proof of the existence, nature and attributes of God Almighty; the Truth of the Revelation of the Sacred Scriptures; and Islam, the religion before Allah [swt], the lord of the worlds.
Historical Proof: it is a comprehensive study of Human Civilization from pre-history to the present. It addresses the Problems of Human Life and come up with the only solution, which is the ultimate conclusion of all the Sacred Scriptures, namely, a World Government, which will establishes justice and peace throughout the world. The Monarchy, which was established by HRH King David [as], the King of Israel, was the prototype of the world government, - the Caliphate: Seat of King David on Earth.
Scriptural Proof: it is the correlation of the Virgin Birth of Jesus the Son of Mary [as] with the Birth of Adam [as], in the Stone Age. Moreover, it was the Family of Adam that was favored with Prophet Hood and Revelation, and all the Sacred Scriptures were confirmed by the Holy Qur'an, - the Guidance to the Caliphate: Seat of King David on Earth.
Furthermore, the Qur'an was revealed in 2 ways: the Prophets were sent to the Nations of Antiquity with the Early Scriptures, which were "Portions of the Book" to guide their own people to Islam; and the prophet Muhammad [pbuh], the Messenger of Allah and the Khatam-an Nabieen, was sent with the "Book" to the world.
Indeed, this is the unveiling of the 19-Part Classification of Al-Qur'an, - the Suhuf-an Mutahharah.