Through the mogul rulers who marched into these countries and forcefully converted the people with fear.
Islam
There are actually three branches of Islam that are dominant in at least one country in Southwest Asia. In order of popularity: Sunni Islam, Shiite Islam, Ibadi Islam.
Islam is the major religion in north Africa and southwest Asia.
It was the indigenous people:
20% Buddhism 30% Hinduism 40% Islam and 10% of Asia's people are Taoism So Islam is the #1 religious group in Asia.
Judaism, Christianity, and Islam were all founded in southwest Asia, more specifically the Middle East.
Islam
Islam and Buddism
Yes. Islam accounts for over 80% of the population in Southwest Asia and North Africa.
Islam came to Central Asia in the early part of the 8th century as part of the islamic-conquest-of-turkestan.
Singapore was apart of Malacca Malay Sultanate so the arrival of Islam to Singapore is almost identical to Malacca.
Around 630 CE onwards.