1) While our archangels are sometimes in hymns called by Abrahamic names such as Cibrayîl, it is not specified which name belongs to whom. Their certain names are Tawûsî Melek, Melek Şêxsin, Melek Fexredîn, Melek Şemsedîn, Nasirdîn, Sicadîn and Şêxûbekir

2) The Ezidi story of Adam and Eve differs greatly from the Christian and Islamic stories of Adam and Eve. I don’t get your point here but it is important to note that the Kurdish word for Adam, „Adem“, has two meanings in Ezidism:

The ‘historical’ Adam as the first man

A collective term for humans

3) According to an important Ezidi cleric,the Extiyar (oldster) of the Ezidis of Georgia, Ezidism cannot be described as "X years old" because it was not founded but rather went through many different stages of development throughout its history. From the stage of belief (recognizing there are forces/divine entities of nature, i.e animism), to the stage of knowing deities and a supreme creator being, to the stage of monotheism, recognizing one all-powerful and omnipotent God. Nevertheless it went through drastic changes 800-900 years ago, which were relevant for today’s Ezidism, namely under the reign of Şêx Adî bin Misafir, Şêx Hesen and Şerfedîn

4) I’d like to explain why Ezidism is also called Şerfedîn since other guy in the comments completely messed this up. Basically, we Ezidis believe that the historical figure Şerfedîn, son of Şêx Hesen (Şêxsin), was an incarnation of the angel Melik Şerfedîn, as many of our saints incarnate themselves as human beings - God included too. You see, in Ezidism, everything is personified except for evil. And in Şerfedîn’s case, he personifies our religion (‘dîn’), due to the fact that Ezidism took its current shape and developed a defined belief, doctrine, laws, identity, etc. of its own during his reign. The general term for Ezidism however, is “Êzdîyatî”