How do Protestants interpret Malachi 1:11 and Isaiah 66:20-21?

>For from the rising of the sun even unto the going down of the same My name shall be great among the Gentiles; >And in every place incense shall be offered unto my name, and a pure offering: For my name shall be great among the heathen, Saith the Lord of hosts. >Malachi 1:11 (KJV) I have been looking for Protestant explanation of this and how it is fulfilled in Christ. The only one that I have found suggests that the incense that is offered to God represents prayers and the pure offering is also those prayers. My problem with this interpretation is the Hebrew. It clearly suggests two distinct offerings, incense and a pure offering. Some translations suggest it as a grain offering but the Hebrew text does not support that. Supporting this offering which is sacrificial in nature is Isaiah 66:21 (KJV), which must be read in the context of the rest of Isaiah 66. >And they shall bring all your brethren for an offering unto the LORD out of all nations upon horses, and in chariots, and in litters, and upon mules, and upon swift beasts, to my holy mountain Jerusalem, saith the LORD, as the children of Israel bring an offering in a clean vessel into the house of the LORD. Are the Levites something other than ministerial priests who make sacrificial offering to the Lord for the people? What is the pure offering if not the offering of Christ on the Cross re-presented daily all over the world in the Catholic Church? What is the Protestant version? What is the reference to Priests and Levites if not that of the "priesthood of believers" and "a sacrificial ministerial priesthood" (Catholic Clergy) taken for the first time after the Cross--from outside the Jewish Rabbinical traditions? How do Protestants say these prophecies have been fulfilled in their churches?