It's an old one, but that doesn't make it the right one. Religions were bred from ignorance. Anything that was not understood by our ancients became a seed for religion. It was an explanation of the world made by the most dominant of the group. It became also a way to get along with others making group activities like hunting easier. Then whoever had the sacred stone was the god...

I wouldn't say ALL religions but definitely the Abrahamic religions.

I would say Zoroastrianism is just a stepping stone used for some of the current main religions. A lot of the main concepts of it were absorbed by the other Abrahamic religions, but I bet that Zoroastrianism was based on an earlier religion that came before it.

I know a little bit about almost all legitmate religions but must admit I've never studied up on Zoroastrianism and know nothing at all about this one. Please educate me. What does this faith believe ?

No way. It definitely had a profound effect on Judaism (and by proxy Islam and Christianity), but that leaves tons of other religions that are completely unrelated to it.

Seeing as: 1. Mosaic/pre-exilic Judaism predates it by over 600 years, and none of the OT scriptures show any indication of being even influenced by it; 2. Hinduism in any of its schools or cults evinces a completely different and even inimical worldview to it; 3. Buddhism evolved from Hinduism, and rejects the Zoroastrian worldview and everyone of its primary doctrines; 4. A view of the world as being a battleground between good and evil forces isn't exactly unique or original to Zoroastrianism. It's evident in the Egyptian Book of the Dead and Old Kingdom religion - though there the "dualism" was between civilization&cultivation on the one hand and savagery&desert on the other. Taoism also does so but with a completely different spin on both the forces and the "conflict"; 5. A belief in hierarchies of celestial and infernal spirts is also niether unique nor original to Zoroastrianism; 6. The only other (once) major Dualistic religion is the now defunct Manicheanism. Christianity, Judaism, and Islam are, however, monotheistic, Hinduism is monistic and Buddhism has monistic tendencies and aspects while being fundamentally nihilistic/solopsistic, So I'd have to say, NO.