If Christ is our high priest, why the need these days for Levites? Didn't Christ offer the perfect offering that the human priesthood could never accomplish? In the light of the message of Hebrews, you have no explanation for taking all those old covenant prophecies literally. Other than you are forced to do so by your hermeneutical rules.
"Therefore, in all things He had to be made like His brethren, that He might be a merciful and faithful High Priest in things pertaining to God, to make propitiation for the sins of the people."Are not all followers of Jesus Christ the true Levites of God? (I have my flameproof underwear on.)"Seeing then that we have a great High Priest who has passed through the heavens, Jesus the Son of God, let us hold fast our confession."
"Therefore, if perfection were through the Levitical priesthood (for under it the people received the law), what further need was there that another priest should rise according to the order of Melchizedek, and not be called according to the order of Aaron?"
"Now this is the main point of the things we are saying: We have such a High Priest, who is seated at the right hand of the throne of the Majesty in the heavens, a Minister of the sanctuary and of the true tabernacle which the Lord erected, and not man."
"But you are a chosen generation, a royal priesthood, a holy nation, His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light;""and from Jesus Christ, the faithful witness, the firstborn from the dead, and the ruler over the kings of the earth. To Him who loved us and washed us from our sins in His own blood, and has made us kings and priests to His God and Father, to Him be glory and dominion forever and ever. Amen."
You're trying to answer one question by asking another. The question on the table is: Does the Bible really say that the Levitical office is an eternal one? So far, you've yet to even attempt to explain away the plain promise in Jer. 33, which says that the Levitical office is as eternal as day and night and the office of the Messiah Himself.
Who was it again who said, "When you have nothing on your side, just argue?"
In the light of the message of Hebrews, you have no explanation for taking all those old covenant prophecies literally.
Hebrews points out the limits of the Levitical priesthood--they could not truly cure sin, only ceremonially purify the flesh (Heb. 9:13) and serve as a reminder of sin (10:3). It explains the superiority of the Messiah's office to theirs. But it does not say that the Levites would cease to be.
And I take the Tanakh's prophecies so seriously (not woodenly literally where a figure of speech is employed, but not simply dismissing what doesn't fit with popular orthodoxy) because Yeshua and His disciples did.
Are not all followers of Jesus Christ the true Levites of God?
Nope. Messiah Yeshua is of the order of Melchiezedek, so those of us who follow Him and are adopted into Him must be of that same order. There are actually two priestly orders in God's Kingdom:
The Levites offer physical sacrifices in the physical Temple for physical (ceremonial, you might say) purification and as a reminder of sins.
The Melchiezedekim offer spiritual sacrifices (1 Pt. 2:5) in their spiritual Temples (1 Cor. 6:19, 2 Cor. 6:16), with our great High Priest having offered the great Sacrifice that alone truely atones from sin so that we may stand before God.
While our sacrifices, which we offer through our own Passover Lamb, are superior, they are also invisible to the world, and thus cannot serve as a reminder of sin and its true cost. Neither can Yeshua's save to those who originally witnessed it--remember that the author of Hebrews still speaks of the sacrifices which were then continuing in the Temple as being a reminder of sins in his own day.
Thus, in the Millennium, when there will be a mortal remnant (Isa. 64:17-20 and 66:18-21) in addition to those who rose with Yeshua and have already been glorified in Him, there will still be a need for that reminder of sins--especially in a society and a world where the effect of sin won't be as obvious to those who did not grow up in this present age.
In the eternal age, I have no doubt that the role of the two priesthoods will again transform, but we simply don't have enough information to know for certain just how they will. God doesn't tell us much at all about that time. But what I do know is that the two priesthoods will continue. Why? Because the Messiah is a priest forever (Ps. 110:4), just as the Levitical line will have priests foever. If the end of sins meant the end of priests, of intercessors, then He would only be a preist for a short age, not forever. I don't have to have all the answers about what their role will be to trust Scripture when it says they will still have a role.