Early history of Islam in India
Trade relations have existed between Arabia and the Indian subcontinent since ancient times. Even in the pre-Islamic era, Arab traders used to visit the Konkan-Gujarat coast and Malabar region, which linked them with the ports of Southeast Asia. Newly Islamised Arabs were Islam's first contact with India. Historians Elliot and Dowson say in their book The History of India, as Told by Its Own Historians, that the first ship bearing Muslim travellers was seen on the Indian coast as early as 630 CE. H.G. Rawlinson in his book Ancient and Medieval History of India claims that the first Arab Muslims settled on the Indian coast in the last part of the 7th century CE. (Zainuddin Makhdoom II "Tuhafat Ul Mujahideen" is also a reliable work.) This fact is corroborated by J. Sturrock in his Madras District Manuals and by Haridas Bhattacharya in Cultural Heritage of India Vol. IV. It was with the advent of Islam that the Arabs became a prominent cultural force in the world. Arab merchants and traders became the carriers of the new religion and they propagated it wherever they went.
The first Indian mosque, Cheraman Juma Mosque, is thought to have been built in 629 CE by Malik Deenar although some historians say the first mosque was in Gujarat in between 610 CE to 623 CE. In Malabar, the Mappilas may have been the first community to convert to Islam. Intensive missionary activities were carried out along the coast and many other natives embraced Islam. According to legend, two travellers from India, Moulai Abdullah (formerly known as Baalam Nath) and Maulai Nuruddin (Rupnath), went to the court of Imam Mustansir (427–487 AH)/(1036-1094 CE) and were so impressed that they converted to Islam and came back to preach in India in 467 AH/1073 CE. Moulai Ahmed was their companion. Abadullah was the first Wali-ul-Hind (saint of India). He came across a married couple named Kaka Akela and Kaki Akela who became his first converts in the Taiyabi (Bohra) community.
There is much historical evidence to show that Arabs and Muslims interacted with Indians from the very early days of Islam or even before the arrival of Islam in Arab regions. Arab traders transmitted the numeral system developed by Indians to the Middle East and Europe.
Many Sanskrit books were translated into Arabic as early as the 8th century. George Salibain his book "Islamic Science and the Making of the European Renaissance", writes that "some major Sanskrit texts began to be translated during the reign of the second Abbasid caliph al-Mansur (754–775), if not before; some texts on logic even before that, and it has been generally accepted that the Persian and Sanskrit texts, few as they were, were indeed the first to be translated."
Commercial intercourse between Arabia and India had gone on from time immemorial, with for example the sale of dates and aromatic herbs by Arabs traders who came to Indian shores every spring with the advent of the monsoon breeze. People living on the western coast of India were as familiar with the annual coming of Arab traders as they were with the flocks of monsoon birds; they were as ancient a phenomenon as the monsoon itself. However, whereas monsoon birds flew back to Africa after a sojourn of few months, not all traders returned to their homes in the desert; many married Indian women and settled in India.
The advent of Muhammad (569–632 CE) changed the idolatrous and easy-going Arabs into a nation unified by faith and fired with zeal to spread the gospel of Islam. The merchant seamen who brought dates year after year now brought a new faith with them. The new faith was well received by South India. Muslims were allowed to build mosques, intermarry with Indian women, and very soon an Indian-Arabian community came into being. Early in the 9th century, Muslim missionaries gained a notable convert in the person of the King of Malabar.