I can accept the UB's analogy of the Christ/Angel of the Lord/Melchizedek very well. I was taught this many years ago by a pastor friend of mine. Very wise and intelligent man. He is now 84 years old and still has all of his "wits about him". He has alibrary of over 5,000 books. There's not much he hasn't researched or studied.
He also told me about the Christ/Michael/Jesus connection. Some believe that "Michael" is actually the "Angel of the Lord" or Jesus, that great "prince" who will stand up at the end of the age and who stood up against the Dragon in the Book of Revelation and over powered him in heaven. Now he has to overpower Satan in earth for the last victory.
There's another theory regarding who Abraham may havemeeting with in Genesis. And that is, since Adam, Seth, Enoch, all the way down to Jesus were priests after the "order of Melchizedek, that it may have been "Shem" himself who was the King of Salem, since Shem was still living at the time of Abraham. If you do an age comparison on the timeline, you'll see that Shem hadn't died yet when Abram was living. And, of course, Salem, the first name for the city of Jerusalem, means "peace". And as we know, Noah was a preacher of righteousness, and righteous through all his generations. Shem inherited the promises of God, therefore it's logical that Shem was the next preacher of righteousness.
Regarding the Lost Books of Eden, here are some links...
The Forgotten Books of Eden do not get into the Sethite priests. I sure wish they did, because I would also be very interested in this. However, I can believe without reference that they were the "physician-priests". This fits nicely into what Moses taught the Levite priests about healing.
But I found some very interesting links