rationalskepticism.org

Oeditor wrote:The first article i read about it was in the Telegraph and the author said it predated all the Abrahamic religions, being about 6000 years old. I suppose that dates it back to the beginning of the universe for the creationists: I wonder what Ken Ham makes of that?

They are scared of lettuce. They abhor pumpkins. They practise maybe the oldest religion in the world. And now, after at least 6,000 years, they are finally being exterminated, even as I write this.

http://blogs.telegraph.co.uk/news/seanthomas/100282674/death-of-a-religion-isis-and-the-yezidi/
Then as the threatened genocide by ISIS became more widely known, an article in the Guardian described it as having been invented by a Muslim Sheikh only about 1000 years ago.

A historically misunderstood group, the Yazidis are predominantly ethnically Kurdish, and have kept alive their syncretic religion for centuries, despite many years of oppression and threatened extermination.

The ancient religion is rumoured to have been founded by an 11th century Ummayyad sheikh, and is derived from Zoroastrianism (an ancient Persian faith founded by a philosopher), Christianity and Islam. The religion has taken elements from each, ranging from baptism (Christianity) to circumcision (Islam) to reverence of fire as a manifestation from God (derived from Zoroastrianism) and yet remains distinctly non-Abrahamic. This derivative quality has often led the Yazidis to be referred to as a sect.

http://www.theguardian.com/world/2014/aug/07/who-yazidi-isis-iraq-religion-ethnicity-mountains
Can't both be right!