Hazrat Ahmad (as) took up the concept of God as presented by the Aryah Samaj, Christianity and Buddhism and compared them with the concept as presented by Islam. The principles of Brahmo Samaj are subjected to exhaustive criticism and the principles of Jewish scriptures are compared with the Holy Quran in all their aspects. Through the force of pure logic and reasoning, he established the superiority of Islam over all other religions. This portion of the book also carries a prophecy about the death of Pandit Dayanand. Hazrat Mirza Ghulam Ahmad (as) also discussed at length the concept of salvation and how it can be attained. The book speaks for itself, and points out its own merits and excellences, and proclaims its own uniqueness and matchlessness compared with other books. It proclaims loudly its challenge: Will anyone come forward and contest? 

(Taken from An Introduction to the hidden Treasures of Islam)