* The migration theory: This theory holds that Zoroastrians migrated from Persia to India during the 6th or 7th century CE. This migration was likely due to the persecution of Zoroastrians in Persia by the Sassanid dynasty. The Zoroastrians who migrated to India settled in the western state of Gujarat.
* The trade theory: This theory holds that Zoroastrianism was brought to India by Persian traders who visited India in the centuries before the Common Era. These traders settled in India and established Zoroastrian communities in the coastal cities of Mumbai, Surat, and Chennai.
It is likely that both of these theories are true and that Zoroastrianism came to India through a combination of migration and trade.
Zoroastrianism had a significant influence on Indian culture and religion. The Zoroastrian belief in a single, all-powerful god influenced the development of Hinduism and Sikhism. The Zoroastrian concept of heaven and hell also influenced Indian mythology and literature.
Today, there are about 70,000 Zoroastrians in India, most of whom live in Gujarat. The Zoroastrians of India are a close-knit community, and they have preserved their unique culture and religion for centuries.