Zoroastrians still exist today and small communities of adherents can be found worldwide, especially in India, Pakistan, Iran and also in major urban areas of the U.S., Canada, UK and Australia. When studying mythology, one can see just how many religions there are in the world, and in many cases one religion/mythology evolves into another as time goes on. Christianity today is far different than what it was only a few centuries ago. Also, Christianity combined with tribal religions gives us beliefs such as the kind of Voodoo that is practiced in Haiti and the southeastern U.S., for instance.
The point is, when one studies world religions and their histories along side world mythologies and cultural traditions, it is quite obvious how one culture borrowed parts of mythologies from previous religions and mythologies to form new belief systems. I encourage all people, whether you have a belief system or not, to study world religions and mythology to understand your fellow humans on the planet we are all forced by nature to share.
From Godchecker.com: As The Wise Lord and God above all other Gods, AHURA-MAZDA was — and still is — worshipped by Zoroastrians as the Creator of the Universe and Source of All Good Things. With the light bulb reference seeming so appropriate, we fondly imagine he created the Universe by flipping a cosmic light switch. 'Let there be light', in fact.
With the holy AMESHA-SPENTAS and also his sons ATAR and MITHRA providing backup, AHURA-MAZDA wages permanent war with AHRIMAN, a deity of unspeakable repulsiveness. AHRIMAN aims to devastate the universe by filling it with pure evil.
Much like GOD and SATAN, they've been battling it out for millennia, but AHURA-MAZDA has a trump card tucked up his sleeve; SAOSHYANT will show up at the last minute and put everything to rights.
Zoroastrianism was founded by Zoroaster (also known as Zarathushtra) squillions of years ago, and flourished despite being such an awkward religion to spell. Its sacred scripture, the Vesta, unfortunately perished in the Great Fire at the Library of Alexandra, and only a remnant of this fascinating text remains. This is called the Zenda Vesta, which means 'Scrap of Vesta Which Is Somewhat Charred But Still Jolly Good'.