Iranian religions in the context of "Zoroastrianism in India"

Zoroastrianism, also called Mazdayasna or Behdin, is an Iranian religion centred on the Avesta and the teachings of Zarathushtra Spitama, who is more commonly referred to by the Greek translation, Zoroaster (Greek: Ζωροάστρις Zōroastris). Among the world's oldest organized faiths, its adherents exalt an uncreated, benevolent, and all-wise deity known as Ahura Mazda (𐬀𐬵𐬎𐬭𐬀⸱𐬨𐬀𐬰𐬛𐬁), who is hailed as the supreme being of the universe. Opposed to Ahura Mazda is Angra Mainyu (𐬀𐬢𐬭𐬀⸱𐬨𐬀𐬌𐬥𐬌𐬌𐬎), who is personified as a destructive spirit and the adversary of all things that are good. As such, the Zoroastrian religion combines a dualistic cosmology of good and evil with an eschatological outlook predicting the ultimate triumph of Ahura Mazda over evil. Opinions vary among scholars as to whether Zoroastrianism is monotheistic, polytheistic, henotheistic, or a combination of all three. Zoroastrianism shaped Iranian culture and history, while scholars differ on whether it significantly influenced ancient Western philosophy and the Abrahamic religions, or gradually reconciled with other religions and traditions, such as Christianity and Islam.

Originating from Zoroaster's reforms of the ancient Iranian religion, Zoroastrianism began during the Avestan period (possibly as early as the 2nd millennium BCE), but was first recorded in the mid-6th century BCE. For the following millennium, it was the official religion of successive Iranian polities, beginning with the Achaemenid Empire, which formalized and institutionalized many of its tenets and rituals, and ending with the Sasanian Empire, which revitalized the faith and standardized its teachings. In the 7th century CE, the rise of Islam and the ensuing Muslim conquest of Iran marked the beginning of the decline of Zoroastrianism. The persecution of Zoroastrians by the early Muslims in the nascent Rashidun Caliphate prompted much of the community to migrate to the Indian subcontinent, where they were granted asylum and became the progenitors of today's Parsis. Once numbering in the millions, the world's total Zoroastrian population is estimated to comprise between 110,000 and 120,000 people, with most of them residing either in India (50,000–60,000), in Iran (15,000–25,000), or in North America (22,000). The religion is thought to be declining due to restrictions on conversion, strict endogamy, and low birth rates.

The Abrahamic religions are a set of monotheistic religions that respect or admire the religious figure Abraham, namely Judaism, Christianity, and Islam, though the term also often encompasses several smaller faiths. The religions of this set share doctrinal, historical, and geographic overlap that contrasts them with Indian religions, Iranian religions, and East Asian religions. The term, introduced in the 20th century, replaced "Judeo-Christian" to include Islam as an Abrahamic religion and acknowledge differences between Judaism and Christianity. However, it has been criticized for oversimplifying cultural and doctrinal nuances.

Ancient Iranian religions were a set of ancient beliefs and practices of the Iranian peoples before the rise of Zoroastrianism. The religion closest to it was the historical Vedic religion that was practiced during the Vedic period. The major deities worshipped were Ahura Mazda and Mithra from Iran to Rome, but Atar was also worshipped, as names of kings and common public showing devotion to these three exist in most cases. But some sects, the precursors of the Magi, also worshipped Ahura Mazda, the chief of the Ahuras. With the rise of Zoroaster and his new, reformatory religion, Ahura Mazda became the principal deity, while the Daevas were relegated to the background. Many of the attributes and commandments of Varuna, called Fahrana in Median times, were later attributed to Ahura Mazda by Zoroaster.

The Iranian peoples emerged as a separate branch of the Indo-Iranians in the 2nd millennium BC, during which they came to dominate the Eurasian Steppe and the Persian Plateau. Their religion is derived from Iranian religions, and therefore shares many similarities with the Vedic religion of India. Although the Persian peoples left little written or material evidence of their religious practices, their religion is possible to reconstruct from scant Iranian, Babylonian and Greek accounts, similarities with Vedic and other Indo-European religions, and material evidence.

The persecution of Zoroastrians is a significant aspect of the later part of the community's history. It is speculated that religious strife existed between Zoroastrians and early Christians, particularly within the context of the Roman–Persian Wars, though the extent of this phenomenon remains unclear. While it was a widespread religion in West Asia for over a millennium, Zoroastrianism began to decline drastically in the aftermath of the Muslim conquest of Persia. The annexation of the Sasanian Empire by the Rashidun Caliphate marked a monumental shift for the former's Zoroastrian-majority society, which was eventually subsumed by the ensuing process of Islamization. During this period, discrimination and harassment against Zoroastrians typically took place in the form of forced conversions and sparse violence. Early Muslims who arrived in the region are recorded to have destroyed Zoroastrian temples or repurposed them as mosques. Zoroastrian practices gradually became circumscribed under Islamic law, which included the levying of the jizya, a tax on non-Muslims.

Early Muslim behaviour with Zoroastrians may have been motivated in part by the fact that they are not explicitly classified as "People of the Book" in the Quran. Although some interpretations do extend this status to the community, the wider consensus among Muslim scholars is that "People of the Book" only identifies the followers of pre-Islamic Abrahamic religions—chiefly Judaism and Christianity—and consequently excludes Zoroastrianism, which is classified as an Iranian religion. Thus, the relative lack of amnesty and privileges for Zoroastrians at this time prompted a large part of the community to flee from Persia to neighbouring India, where they were granted asylum by local kings. The descendants of these Zoroastrian refugees of the early Muslim conquests are known as the Parsi people, who comprise the most prominent community of Indian Zoroastrians today.

Zoroastrianism is considered to be the oldest religion still practiced in Iran. It is an Iranian religion that emerged around the 2nd millennium BCE, spread through the Iranian plateau, and eventually gained official status under the Achaemenid Empire in the 6th century BCE. It remained the Iranian state religion until the 7th century CE, when the Arab conquest of Persia resulted in the fall of the Sasanian Empire to the nascent Rashidun Caliphate. Over time, Zoroastrians became a religious minority amidst the Islamization of Iran, as due to persecution many fled east to take refuge in India. Some of Zoroastrianism's holiest sites are located in Iran, such as Yazd.

Today, Iran has the second largest Zoroastrian population in the world, behind only India and possibly the Kurdistan Region. The official Iranian census of 2011 recorded a total of 25,271 Zoroastrians in the country, but several unofficial accounts suggest higher figures.

The Western religions are the religions that originated within Western culture, which are thus historically, culturally, and theologically distinct from Eastern, African and Iranian religions. The term Abrahamic religions (Judaism, Christianity, and Islam) an is often used instead of using the East and West terminology, as these originated in the Middle East.

Western culture itself was significantly influenced by the emergence of Christianity and its adoption as the state church of the Roman Empire in the late 4th century and the term "Christendom" largely indicates this intertwined history. Western Christianity was significantly influenced by Hellenistic religion (notably neoplatonism) as well as the Roman imperial cult. Western Christianity is largely based on the Catholic Church's Latin Church tradition, as opposed to Eastern Orthodoxy, from which it was divided by the Great Schism of the 11th century, and further includes all Protestant traditions that split with the Catholic Church from the 16th century onward.