Allâhu ta’âlâ created mankind. All people are the born slaves of Allâhu ta’âlâ. Allâhu ta’âlâ is the creator, the Rabb, not only of a certain nation or race or only of the world, but also of the entire humanity as well as of all the worlds of existence. In the view of Allâhu ta’âlâ, all people are the same, and no one is different from another. In addition to a body, He has given a soul to each one of them. He has sent them Prophets ‘alaihimus-salawâtu wattaslîmât’ to lead them to spiritual and physical perfection and to guide them on the right way. The greatest ones of these Prophets are Âdam, Nûh (Noah), Ibrâhîm (Abraham), Mûsâ (Moses), Îsâ (Jesus), and Muhammad Mustafâ ‘alaihim-us-salâm’. The tenets of belief that they taught are the same. The final and the most perfect system is Islam, taught by Muhammad ‘alaihis-salâm’. No Prophet will come after Muhammad ‘alaihis-salâm’. For the religion he brought is at the uppermost point of perfection and has no deficiency to be meliorated; and Allâhu ta’âlâ has declared that mankind will never be able to change or interpolate this religion. The well-known German Writer Lessing (1729-1781), in his book Nathan der Veise (Nathan the Wise), likens the three (heavenly) religions to three identical rings made of sapphire. Yet he feels uncertain as to “whether one of them is genuine and the other three false?” Yet the fact is that all three of them are genuine essentially. However, as a result of various personal interests, advantages, sordid and biased considerations, jealousies, superstitions, misinformations and misconstructions, men failed to understand this reality, inserted numerous wrong beliefs and ideas into the Musawî and Nasrânî religions, and thus changed, defiled these true religions, which were based on Tawhîd (unity, oneness of Allâhu ta’âlâ). Only Islam remained in its original purity. Consequently, adherents of these three religions became hostile to one another. This hostile attitude they have assumed means to oppose to the Will of Allâhu ta’âlâ. For, as we have already stated, Allâhu ta’âlâ invites all people to the true religion. In the view of Allâhu ta’âlâ, all people, regardless of race, are equal. All people are Ummat-i-da’wat. And the true religion is Islam, which is the only continuation of the original forms of Judaism and Christianity.
Despite all the wrongfull and inimical volley of vituperations carried on against Islam and all the stupendous efforts put forth for the spreading of Christianity, there has been an ever growing increase in the number of Muslims on the earth. Some of these Muslims remained Muslims because they had been born in Muslim families. However, besides these people there are also people who accepted Islam although their parents had been in other religions and they therefore had been given their family education in other religions. Among these people are universally renowned diplomats, statesmen, scientists, scholars, men of letters, writers, and even men of religion. These people studied Islam well, admired its greatness, and became Muslims willingly. In addition to these people, many other universally known celebrities met the Islamic religion with deep respect and admiration although they did not officially become Muslims; they even believed in the fact that Islam is the true religion and did not hesitate to express this belief of theirs. Scientists, philosophers, and politicians, admired by the entire world, first of all believe in the fact that Allâhu ta’âlâ exists and is One and that He is the Creator of all beings.
Among the people who accepted Islam, there may be those who became Muslims of necessity, for the sake of some advantages, or for advertisement. For instance, a non-Muslim woman may have accepted Islam without studying and learning Islam well for the purpose of marrying a certain man who happened to be a Muslim, or an Indian pariah may have done so in order to regain his lost civic rights. However, the fact that well-known scholars, scientists and writers accept the Islamic religion only after a long observation. Perhaps a person who was born a Muslim and has spent his life among Muslims is totally oblivious of these superiorities. Yet when a person belonging to another religion studies Islam, he will see the difference clearly and will admire Islam.
 Ref: These paragraphs are quoted from the book “Why Did They Become Muslims?” page 7. “Why Did They Become Muslims?” contains a few paraphrased selections from the statements made by some of the many non-Muslim, who are famous great commanders, statesmen and scientists celebrities who believed in Allâhu ta’âlâ and admired Islam; these statements reflect their views of Islam. The book is published by Hakikat Kitabevi, Istanbul. You can find the whole book and the other valuable books in the web site www.hakikatkitabevi.com.tr and download in PDF format for Adobe Acrobat Reader, EPUB format for iPhone-iPad-Mac devices and MOBI format for Amazon Kindle device.