All information is taken from: http://www.zoroastrianism.cc/universal_religion.html#
A Universal Religion: Good Thoughts, Good Words, Good Deeds
The religion known in the west as Zoroastrianism, and by its founder as the "Religion of Good Conscience", has laid claim to being the first Monotheist religion, the first Universal religion and the root of much of Jewish, Christian and Islamic doctrine and belief.
Over the millenia, the words and compositions of its founder, one Zarathushtra Spitaman, (known to us by the Greek alliteration of his name - Zoroaster), were lost due to passage of time and the obsolescence of its language. Its original message was lost because of accidents of history, as libraries and books were burned again and again by invaders and its wise men were either killed, enslaved, deported or went into hiding.
However, thanks to the long, arduous and painstaking work of literally hundreds of scholars in the last 200 or so years, the original message of Zoroastrianism, the message of its "Manthran" (Thought-provoker) Zarathustra, Zoroastrianism has surfaced once again, revealing it as ever-relevant, unique and inspiring.
Zarathushtra's is a message about a spirituality that progresses towards self-realization, fulfillment and completeness, as a good creation of a totally good God. It is a message of freedom - freedom to choose, freedom from fear, freedom from guilt, freedom from sin, freedom from stultifying rituals, superstitious practices, fake spirituality and ceremonials. The God of Zarathustra, is not a God of "Thou shalt" and "Thou shall not". God in Zoroastrianism does not care what you wear, what and when you eat or where and when you worship. God instead cares how righteous, progressive and good you are.
The Zoroastrian Religion pictures humanity as the growing and evolving creation of a God that respects it, and wants it to collaborate in the task of preserving, nourishing, fostering and refreshing this Living World of ours. A Zoroastrian is supposed to progress towards God (Ahura Mazda) by his own choices. Choosing to do good, and to avoid choosing to do wrong or evil. Zoroastrianism is thus the first truly ethical religion of mankind and teaches that mortals achieve their goal of god-likeness and spiritual completeness by fighting evil through good thoughts, words and deeds.
Mazdayasna (The Worship of the Wise), another name for Zoroastrianism, teaches the equality of all mortals before their Wise creator God; who only sees a difference in righteousness among mortals. Thus there is equality of race, nation, gender and social position.
In its most sacred prayer the Ahunavar (Choice of the Lord), Zoroastrians are taught that their Lord and leader are to be chosen, through a Good Mind - a mind that is a well-informed and benevolent - and only on account of their individual righteousness. This sets the basis for a spiritual and political democracy as far back as around 4000 years ago! Only an informed and unbiased mind is capable of making a truly righteous choice and this is precisely, the invitation of Zarathustra, the great Aryan teacher of righteousness, when he tells us:
"Listen to the best things with your ears, reflect upon them with an unbiased mind. Then let each man and women for him or her self choose between the two ways thinking. Awaken to my doctrine, before this great event of choice comes upon you"
[Avesta: The Gathas: Song 3:2 (Free Translation)]