There is much on the Jebusite/Melchizedek connection:
This from http://www.catholic.com/thisrock/2000/0010bt.asp
The Law of Moses was always and only meant to be observed by the Jewish people. We see in the Old Testament many non-Jews who were worshipers of the true God, such as Melchizedek the Jebusite
and Jethro the Midianite, who were both priests of God (Ex. 3:1, 18:12), Balaam the Pethorite, who was a prophet of God (Num. 22:18—19), and Naaman the Syrian, who came to worship God and was in no way asked to embrace the Mosaic Law (2 Kgs. 5:15—19).
Eugene H. Merrill, “Royal Priesthood: An Old Testament Messianic Motif,” BibSac 150 (1993): 60. See also Kraus, Theology, 111, who says, “Following the ancient Jebusite order, the Davidic kings were priest kings, ‘after the order of Melchizedek.’
Also from http://www.c-c-c.freeserve.co.uk/nr3-03.htm
“Araunah the king” — surely because, as a native Jebusite, he was the descendant of Melchizedek, the priest-king of Salem
; and thus his threshing floor was the original site of the shrine of El Elyon, the local deity of Salem. And now David, the servant of YHWH, is taking it over, and taking over, too, Araunah’s titles and functions, himself becoming officially priest-king of YHWH/El Elyon. Now see Ps 110:4: “YHWH said to my Lord: Sit on my right... YHWH has sworn an oath he will not change: You are a priest for ever according to the order of Melchizedek”.
Salem is traditionally identified
as the Jebusite stronghold of old Jerusalem
. Accordingly, there has been much speculation about its king. Though some have identified him with the preincarnate Christ or with Noah’s son Shem, it is far more likely that Melchizedek was a Canaanite royal priest whom God used to renew the promise of the blessing to Abram, perhaps because Abram considered Melchizedek his spiritual superior.*my note: why would it be unreasonable to think Christ became incarnate as a Jebusite in Jerusalem during Abraham's time?
Also from: http://www.dioceseofnewark.org/96inter.htmlIn the encounter with Melchizedek, Abraham makes a covenant with a Jebusite priest who worships El Elyon
, a Name eventually taken over by Israel for God. Melchizedek and his people are outside the covenant God is making with Abraham, but still recognized on a spiritual level.
Also: Dr Peter Pett BA BD(Hons) London DD:
In 2 Samuel 8.18 we are told that David’s sons were ‘priests’. This probably refers to their status in Jerusalem in the old Jebusite priesthood of Melchizedek
, which David as conqueror would inherit. It was an intercessory and status-giving priesthood rather than a sacrificing priesthood, and would give them important status in Jerusalem. Others have suggested that the word also meant ‘high officials’
There is much more that can be posted but the idea is well laid out.ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š Of course, with any topic, there are those who refute but, from my studies, it seems quite reasonable that the Melchizedek order was originally Jebusite.
Truth or Bust