Zoroastrianism thrived among other faiths
Finding Religious Acceptance
In sixth century B.C., when the Zoroastrian king Cyrus the Great established the Persian empire, Zoroastrianism was the major religion of the empire. But he allowed his conquered subjects to continue following their native religions, thus introducing the principle of separation of church and state, which was generally followed for over a 1,000 years under successive Zoroastrian kings and queens.
When some Zoroastrians migrated to India, they assured the Hindu king who gave them refuge that they will not convert his subjects. For over 1,300 years the Parsis (Persians), as Zoroastrians are known in India, kept their promise and lived in harmony with other communities in the Indian subcontinent.