This Book " Modern Cosmology and the Quran " has, among other things, three mainobjectives, namely; (1) To prove the existence of God, the Creator of the whole Universe,(2) To confirm the Authenticity of the Quran, and (3) the need for religious harmonybetween Monotheistic Religions.The Quran has mentioned many signs in Nature which point to the existence of God andHis Power. God insistently appeals to people to travel in the Earth and Heavens to seek andknow His creative power, and to see how He has created every thing in the physicalUniverse accurately and with proportion, to look into Nature and examine the life formsand their activities, to contemplate upon the celestial bodies and the system that governs.them,and to examine the scientific signs and allusions revealed in the Quran. The principal aimis to incite the human being to reflect on the works of the creation as evidence of theGreat Creator of the Universe, and to ensure that the scientific phenomena revealed in theQuran fourteen centuries ago are perfectly in conformity with modern knowledge. Whenpeople perceive this, they come to know more deeply the beauty and splendour of theCreator''s system and the infinitude of His Might.Regarding this fact, God says in the Quran:" .. Travel in the land and see how God originated the creation" (Surah 29, verse 20)." Verily, in the Heavens and the Earth are signs for those who believe"(Surah 45,verse 3)." It is the work of God Who perfected all things" (Surah 3,verse 190). As we know that the Quran was revealed to Muhammad Who was an illiterate man, and who was living in an environment dominated by ignorance. If he wasthe author of the Quran, how could he have written facts about Cosmology in the 7thcentury A.D. that today are shown to be consistent with modern science. Moreover, ifsomebody else had written it for him, how could he then pronounce truths of a scientificnature that no other human being could possibly have developed at the time, and all thiswithout once making the slightest error in his pronouncements on the subject.Apart from the astronomical evidences revealed in the Quran and which are proved tobe scientific facts nowadays, God has challenged disbelievers to produce a singlechapter like chapters of the Quran in their beauty, eloquence and wise legislation. Eversince its revelation, fourteen centuries ago, no one has been able to meet this challengethen or today though at that time of revelation, the Arabs were very eloquent peoplewho used to compose beautiful and excellent poetry in Arabic. With respect to this,God says in the Quran:" And if you are in doubt what we have revealed to our worshiper, then produce a chapter like it, and call your witnesses besides God if you are truthful.And if you do not do it, and you can never do it, then fear the Hell.."( Surah 21, verse 23-25 ). The third main objective of this Book is the need for religious harmony betweenMonotheistic Religions, namely: Judaism, Christianity and Islam since three of themhave, more or less, the same basic Divine Doctrines and Guidance that lead human kindto the right path, and because their adherents believe in the same God and worship Him,each according to the ritual activities they believe in, therefore no real reason whyreligious harmony does not exist between these religions. Such coexistence constitutesthe bedrock of Justice and World Peace nowadays. In this connection God says in the Quran:"Say: O people of the Book ( Jews and Christians ) come to a word that is justbetween us and you that we will worship none but God" (Surah 3, verse 64 ).It is obvious that this Quranic verse is an invitation to inter-religious dialogue in orderto find a mutual basis for peaceful co-existence and harmony between religions.