Islam represents more than 1.6 billion believers worldwide. Thereby it is the second largest religion behind Christians. But there are many reservations and prejudices with regard to this belief in particular in the western world. Because of that the famous author James A. Michener (1907-1997) wrote the following text already in 1955. Trying to understand the characteristics of Islam is today more topical than ever. This booklet, getting for yourself or giving as a present, is suitable to start in this way, that you will be able to know the origin and nature of Islam.