Scholarly account demystifies strange religion
Zoroaztrianism, is the least known of the world's great religions. The reasons for this state of affairs emerge from Zaehner's history of its strange evolution from the vision of one man, the founder of the faith - Zoroaster, through its syncretic evolution and recasting until its eventual near disappearance with the fall of the Sassanian empire. He tells a tangled tale with numerous by ways, revisions and recursions. The shear complexity and confusion surrounding the faith is why long after its demise only specialist know much about. Now if you really want to know what people at various times since Zoroaster proclaimed his vision Ca. 2000 BC (or maybe much later) made of his religion you can find it all in this book.