Zoroastrianism is the religion and philosophy based on the teachings ascribed to the prophet Zoroaster, after whom the religion is named. The term 'Zoroastrianism' is synonymous with Mazdaism, i.e. the worship of Ahura Mazda, exalted by Zoroaster as the supreme divine authority.
Zoroastrianism was once the dominant religion of much of Greater Iran, and was a formative influence on that region's history and traditions. It is uniquely important in the history of religion because of its possible formative links to both Western and Eastern religious traditions.
Basic beliefs of Zoroastrianism
There is one universal and transcendental God, Ahura Mazda, and the one Uncreated Creator to whom all worship is ultimately directed.
Ahura Mazda's creation evident as, asha, truth and order, is the antithesis of chaos, evident as druj, falsehood and disorder. The resulting conflict involves the entire universe, including humanity, which has an active role to play in the conflict.
Active participation in life through good thoughts, good words and good deeds is necessary to ensure happiness and to keep the chaos at bay. This active participation is a central element in Zoroaster's concept of free will, and Zoroastrianism rejects all forms of monasticism.
Ahura Mazda will ultimately prevail, at which point the universe will undergo a cosmic renovation and time will end. In the final renovation, all of creation will be reunited in Ahura Mazda.
There will then be a final purgation of evil from the Earth and a purgation of evil from the heavens. In the end good will triumph and each person will find himself or herself transformed into a spiritualized body and soul. Those who died as adults will be transformed into healthy adults of forty years of age, and those who died young will find themselves permanently youthful, about age fifteen. In these new spiritual bodies, humans will live without food, without hunger or thirst, and without weapons. All humanity will speak a single language and belong to a single nation without borders.
In Zoroastrian tradition the wicked is represented by Angra Mainyu, the "Destructive Principle", while the compassionate is represented through Ahura Mazda's Spenta Mainyu. It is through Spenta Mainyu that transcendental Ahura Mazda is immanent in humankind, and through which the Creator interacts with the world.