The Middle Ages were already under way when Islam began to spread in Arabia. It spread to Persia and Palestine. Then it spread into India, across North Africa, into other parts of Africa, to Asia Minor, to Central Asia, Southeast Asia, to Spain, Sicily, Southern Italy, the Balkans, the Philippines, and Indonesia. There is a link below.
If we take time as a measure of the spread of religion,then since its establishment ,Islam is the religion which spread or still spreading rapidly in Asia followed by Christianity.
... the religion's name is not Muslim, it's Islam, and yes, it was founded in Medina/Mecca, which is in Asia Minor
To be entirely fair, it was Türkic Tribes of Central Asia who spread Islam to China, but the reason that Arabs spread Islam to Spain, Sicily, and India was that they genuinely believed it to be the correct religion.
Islam spread rapidly during the Middle Ages in almost all directions. By the year 750 AD, Muslims had conquered the Mediterranean coast of Africa, Spain, Palestine, parts of Asia Minor, Persia, and parts of India. After that, Islam continued to spread in the Middle Ages, primarily in Asia, areas in the Philippines, Indonesia, China, and Africa. Muslims also took over the Balkans, and, briefly, parts of Italy.
The spread of Greek culture.
India, Africa and Southeast asia
Within a period of 200 years, Islam spread all over the world. All world regions had been exposed to and had someone to begin following Islam.
Islam religion is spread all over the world. However, Islam religion is major religion in the Middle East, North Africa, and Asia.
India, Mesopotamia, Asia Minor, Egypt
Judaism, Christianity, and Islam were all founded in southwest Asia, more specifically the Middle East.
Islam spread to the island of southeast Asia through traders and merchants. Many of the city states in Malaysia and west Indonesia had a strong maritime trading orientation and as a result, accommodated many Muslim merchants from Arabia, India, and the East African coast. As a result, the ideas of Islam became incorporated in those areas, supplanting the previous Buddhism. In the rest of Southeast Asia, such as Thailand, Cambodia, Laos, Burma, and Vietnam, the orientation was much more inland and river-based trade, meaning that Islam did not have the same inroads and access.