In addition to this we have numerous historical documents and proofs...
In addition to this we have numerous historical documents and proofs, that the Noble Prophet (s) had dispatched several letters to Persian, Byzantine, Roman, Egyptian, and Abyssinian rulers as well as to several other tribal leaders, in order to invite them towards the Divine religion. However if Islam was not universal and there were no universal invitations dispatched by the Prophet of Islam (s), then there would have been an excuse for other nations to reject Islam.
On this basis one cannot believe in the legitimacy of Islam without associating it with the application of its Divine sacred law. Therefore nobody is exempted from this belief. a. Qura’nic proofs for the universality of Islam As indicated earlier, the best proof and the most reliable argument for the establishment of such issues is through the Noble Qur’an, its righteousness and creditability has been proven in the previous lessons.
Furthermore if someone reflects upon the verses of this Divine Book of God, he would certainly realise that the invitation to embrace Islam is universal and not specialised towards a specific race or language. Throughout the Qur’an mankind has been addressed as: O people, or as: O children of Adam (refer to al-Baqarah:21, al-Nisā’:1,174, Fātir:15), and has referred to the guidance of all human beings (nās and ‘ālamīn).
The Qur’an also indicates the universality of the Prophet of Islam (saws) for all men and invites all who are aware of him to follow his way. From another standpoint, the followers of other religions are regarded and addressed as the People of the Book, and the prophecy of the Prophet of Islam is also proven to them.
Moreover the purpose of the dissension of the Noble Qur’an upon the Prophet is considered as the victory and mastery of Islam upon other religions (refer to al-Saff: 9, al-Fath:28, al-Tawbah:33). By focusing upon these verses there should be no ground left to harbour spurious doubts concerning the universality of Islam. The Eternity of Islam The mentioned verses through the utilisation of common phrases establish the universality of Islam.
Similarly through being unconditional regarding time it denies the limitation of Islam to a certain period, and in particular remarks:" “It is He who has sent His Apostle with the guidance and the religion of truth that He may make it prevail over all religions” (al-Saff:9. see also al-Fath:28 and al- Tawbah:33).