What is Zoroastrianism?

I know that Zoroastrianism is an ancient Persian religion founded by the prophet Zoroaster, the principal belief of which is in a supreme deity and in a cosmic struggle between two spirits, one good and one evil. I have also learned that this religion is centered around a monotheistic doctrine based on the worship of Ahura Mazda. But what I wish to know is Ahura Mazda the same supreme god worshiped by the ancient Persians, or is he the modern equivalent to the God that Jews, Christians, and Muslims believe in. Also, do Zoroastrians only worship Ahura Mazda, or do they also pay homage to the other ancient Persian gods and goddesses as well? Please, if there is anyone out there who is Zoroastrian or knows a lot about world religions, help me to obtain the information that I so wish to seek.

Something atheists like to accuse Christians of borrowing from

In short:

ZOROASTER
c.630 - c.550 BC
Persian Prophet
Zoroaster, also called Zarathustra, was an ancient Persian prophet who founded the first world religion - Zoroastrianism.

According to the 'Zend Avesta', the sacred book of Zoroastrianism, he was born in Azerbaijan, in northern Persia, probably in the seventh century BC, although some scholars put the time-frame for Zoroaster much earlier.

He is said to have received a vision from Ahura Mazda, the Wise Lord, who appointed him to preach the truth. Zoroaster began preaching his message of cosmic strife between Ahura Mazda, the God of Light, and Ahriman, the principle of evil. According to the prophet, man had been given the power to choose between good and evil. The end of the world would come when the forces of light would triumph and the saved souls rejoice in its victory.

This dualism was part of an evolution towards monotheism in the Middle East. Zoroaster's teaching became the guiding light of Persian civilization.

After Alexander the Great conquered Persia Zoroastrianism began to die out in Persia, but it survived in India where it became the basis of the Parsi religion.

Zoroastrianism is the religion and philosophy based on the teachings ascribed to the prophet Zoroaster (Zarathustra, Zartosht). Mazdaism is the religion that acknowledges the divine authority of Ahura Mazda, proclaimed by Zoroaster.

As demonstrated by Zoroastrianistic creed and articles of faith, the two terms are effectively synonymous. In a declaration of the creed ? the Fravar?n? ? the adherent states: "?I profess myself a devotee of Mazda, a follower of Zarathustra." (Yasna 12.2, 12.8)

While Zoroastrianism was once the dominant religion of much of Greater Iran, the number of adherents has dwindled to not more than 200,000 Zoroastrians worldwide, with concentrations in India and Iran (see demographics below).