The Quran tells us that the Prophet of Islam was sent as “a mercy for all mankind” (The Quran, 21:107). There is nothing mysterious about this. It is a natural reality, which can be understood by making an academic and rational study of it.
When a human being is born, he finds himself in a world, which is astonishingly vast and complex. How man has to relate himself to his world and how he has to form his ideas are matters of which he is totally ignorant. Neither is his birth accompanied by a guidebook, nor does he find a board set up on some hilltop inscribed with the necessary guidelines, which he is to follow. That is why man continues to grope in the dark, finding only scraps of knowledge to lay his hands on.
Through Prophet Muhammad, God Almighty sent the Quran to serve as a guidebook that provides guidance to all humanity.