This book is written in the nature of a “key” for those Muslim brothers of ours who have just a smattering of knowledge on how the Islamic religion has developed, and it has been written for those non-Muslims willing to know the fundamentals of Islam. Islam, the most up-to-date and the most immaculate of the world’s existing religions, is based upon very humane and very logical principles. Without going into details, this book touches upon the fundamentals of Islam and makes a comparison of Islam with other religions. It answers criticisms raised against Islam by its adversaries and explains as compendiously as possible the qualifications essential for being a good Muslim.