As traders from the Muslim world introduced Islam to the region, the expansion of trade between south and southeast Asia contributed to the spread of religion. A surge of diversity was brought by the emergence of new Hindu and Buddhist republics.
Hinduism, Buddhism, Sikhism, and Jainism are four of the world's major religions that originated in South Asia. Christianity, Islam, and Judaism are the three that originated in West Asia and came later. Prior to the spread of Islam, Zoroastrianism predominated in ancient Persia (modern-day Iran), and it is still practiced today in India.
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