It way predates Islam.
I don’t pretend to understand what they believe, but it is ancient. That said, they have adopted some things from Christianity and from Islam. It is a fact. Zoroastrianism is an element in it.
Have been told the Islamists call them devil worshipers and kill them with no thought.
The way toward sharia. Any and all. Other muslims too.
Again, the term "angel" is what we use and what they have used due to the long domination by Christianity and Izlam.
This would be correctly termed as some kind of demi-god. It's also called the Angle of Light, so offending Christian and Islamix ideas of the devil
Not as antagonistic as the religion of the Mandeans (southern Iraq) who have Adam, Noah and John the Baptist as their prophets and consider that Moses, Jesus and Mohammad were false prophets! (so p!$$ing off all three at the same time! Score!)