It betrays a profound misunderstanding and immaturity on your part in spiritual matters to equate the central tenant of prophet Zartosht's conception of the role of Mankind in the cosmic scheme of existence and being with what is a superficial, and frankly ignorant, understanding of his successor prophet Muhammad's articulation of the same concerns. I am motivated in writing this response for the mature, inquisitive, reader who wishes to broaden his or her horizons in terms of understanding the shared heritage of Humanity as left to us by profound and significant individuals in the past.

The analog of the cosmic battle between Ahura-Mazda (in the Arabic Qur'an called Al Aziz-Al Hakim, in English The Mighty-The Wise) and Ahriman in the Qur'an is when God tells Adam that Satan is "My enemy and your enemy, so treat him as an enemy". This metaphysical duality, presented as a central issue for sentient beings in both religions, with assurances in both religions as the ultimate "victory" of God and the "right minded" and vanquishing of the enemy, is a metaphysical (or if you prefer psychological) matter. The essence of the matter is the ontological requirement of "distinguishing" for the emergence of "form", which arises from division of the continuum (which is a Unity), i.e. the number 2. In capsule, the fundamental difference between sentient perceptions is that of those who believe in the primacy of meaning to form, and those who believe meaning arises from form. This is "the choice".

& Apparently it is left to this Iranian "neo-Zoroastrian" Muslim to elucidate what precisely was the defining moment in the history of our people, the Iranian People. Iran, a feminine name (the sister of Iraj), is the name that our people adopted to distinguish ourselves from our "Indo-European" brethren. It means Aryan, and Aryan means "Noble Minded". (In the Gita, you have Krishna utter "Among the people I am the Arianman".)

And what was the reason for this departure from the understanding of our Indian brethren? It was the message of the prophet Zartosht. Zartosht rejected the "Deava" and plutora of "gods" and properly considered them as "daemons". Zartosht asserted the primacy of the Creative Spirit and the corrosive destructive spirit of "The Lie" (or 'error', for the materialist). He rejected the pollution of the Earth, rejected the destruction of built environment, and rejected the "destructive" mindset.

This is why in Iranian tongues, a "Deev" is a daemon while in Indian and European tongues is is "divine". And as Iranians we see comical manifestations of this metaphysical misunderstanding, such as for example, when the "Indo-European" readings of Buddhist scripture has "daeva" ("Gods" according to them) come to Buddha for "instruction", whereas we correctly note that these are "daemons" who come to the Realized One for illuminating instruction. (And in the Qur'an we have the "Jinn" -- in Sura 72 -- just as in Buddhist scripture, listen to the words of the Prophet to be instructed and illuminated.)

The error of closed minded individuals who cling to cultural manifestations of timeless realizations of profound individuals of mankind is to seek the "other" in their kin and fall into the error of creating imaginal and false boundaries where none exist. This, properly understood, is the work of the "destructive enemy", on whom and its adherent there is an eternal ban in the 'Kingdom of God'. And to fight this, which is ultimately a personal and internal matter, is the foremost task of the thinking sentient being.

As a matter of fact, for the thoughtful sentient, all metaphysical and "cosmic" matter are understood to be inner, psychological, affairs, the "inner Jihad".

Truly for Seekers I shall speak of those
things to be pondered,
even by one who already knows,
With Praise & Worship,
for The LORD of Good Purpose
The Mighty Wise One,
and for Truth.

Hear with your ears the best things,
reflect with clear purpose,
each man for himself,
on the two choices for decision,
being alert indeed to declare yourselves for Him
before The Great Requital

- Zartosht

Wa Salaam.