With the very creation of man, God began sending prophets to the world. The very first man—Adam—was also the first prophet. This series of prophets continued from Adam to Jesus Christ. The prophets were sent revelations to convey the divine message to every group and community of people in this world. Finally, God decided to send the final prophet—Prophet Muhammad—to whom He would send the last divine book, which would be preserved with the message of God for all time so that no further prophets were required anymore. If you want to know what is Islam, you must look to its sources: The Quran and the Sunnah. It presents Islam as it is, drawing on its sources rather than judging it by later interpretations and commentaries or the practices of present-day Muslims in different parts of the world. A distinction is made between Islam as presented by the Prophet Muhammad and his companions (information about which is available to us in the Quran and the sunnah) and Islam as represented by later Muslim generations — both in theory and practice. This is what we call the scientific approach.