Muslim merchants set up trading posts throughout southeast Asia and taught Islam to people there.
Religious differences still divide Hindus and Muslims.
Islam did not spread the same way throughout all of Africa. In North Africa, Islam spread by conquest. In West Africa and along the Indian Ocean, Islam spread by contact between Muslim merchants and local Non-Muslims.
Throughout southeast Asia.
Sunni Islam spread throughout the eastern Mediterranean region.
Islam
Buddhism.
Islam and Christianity.
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.
As Jews were exiled and moved there.
they spread budhism
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.