The English translation of the book ‘Hujjat-ul-Islam’ by the Promised Messiah (as). Mere claims do not prove that a certain religion is true. The distinct hallmark of a true and living religion is that it establishes the existence of God in every age and with undeniable evidence. In this work, Mirza Ghulam Ahmad of Qadian, the Promised Messiah and Mahdi, explains that Islam is a living religion that is not based on tales of the past, but possesses the power to endow its followers the ability to manifest miracles and signs even today. A tree is recognised by its fruit he states, and the fruits of Islam can be tasted by all even today.