Throughout the world there are blended religions. Missionaries come to a region and sometimes try to reach common ground with the converts. The results are a mix of the old religion with elements of the new religion ala Santaria. Santaria is a mix of mostly Voodoo and some elements of Christianity.
I have read a tiny book on the Yezidi and there may be some truth to the claim that the Yezidi religion contained the preKurdish religion before Islam was imposed on most. The majority of Yezidi seem to support this line. Others notably from Sinjar stand by their own identity as Yezidi neither Kurd nor Arab.
The Yezidi seem to have blended many elements from other religions. The only thing I see that seems close to Judaism is calling the new year head of the year. Jews do a memorial service for the dead at the same time like the Yezidi. However, the Jewish service takes place in a house of worship and not a cemetary. Moreover only women perform this ritual in the Yezidi culture. As for Christianity they paint eggs in the spring.
What appears to have happened is a Sufi mystic Sheik Adi preached some form of Islam
to the Yezidi. This version of Islam was blended into the Yezidi faith. The Yezidi have their version of Ramadan that lasts three days. The legend has it Mohammed hear the number wrong. The Yeazidi even have their own version of the Haj. The belive this mystic transported the sites where Ishmael and Hagar went to Northern Iraq. Like Muslims they believe Ishmael was the intended sacrafice not Isaac.
The religion contained the legend of peacock angel. The Yezidi to be the children of a union of the peacock angel and Adam. The Yezidi also venerate black snakes. The source of this is that there was a hole in the Ark and a black snake plugged the hole.
The Yezidi lived in remote regions to escape persecution and lived apart from people of other religions. Their scripture and stories were remembered by a select few and until recently not placed on paper. The religion is mostly kept by designated people and lay people don't do much except join in festivals, parades and abide by some odd taboos that involve items that sound like the local word for Satan.
The author has an amusing view that TV is destroying the Yezidi culture. The Yezidi
like most would rather watch TV than listen to people that sing ancient Yezidi balads. I guess if we lived long enough we might defang Muslim extreemists by jamming their TV's with all the Michael Landon shows. I can see it now, Farouk I blow myself up later after I watch Bonanza.
The Yezidi society has rigid castes and who marries whom is controlled by Caste. A Yezidi historically never marries an outsider or accross his Caste. There was a story of a mixed caste marriage where the couple fled to Mosul and was killed. The Yezidi religion seems far less oppressive on women in general than Islam. There is song and dance so it is less austere than Islam.
There are also shrines for every ailmentr with a guardian. A Yezidiwith some sort of problem is supposed to go to the shrine make an offering (cash) and the problem is supposed to be alieviated. Perhaps there is a shrine to cure the mental impairment of Communists or general stupidity for Uptown Steve.
The author sees outside influences TV and democracy changing the culture. However, it seems abundantly clear that this culture has been influenced by the adjacent cultures. However, there are a wide range of views on who the Yezidis are and we may never have an answer.
Beamish in 08, Ducky to North Korea and John Brown to be relabotomized by Cuban health care.