When God chose a priesthood, an holy nation in the past, they would be above all people.
Exodus 19:5 Now therefore, if ye will obey my voice indeed, and keep my covenant, then ye shall be a peculiar treasure unto me above all people: for all the earth is mine:
Exodus 19:6 And ye shall be unto me a kingdom of priests, and an holy nation. These are the words which thou shalt speak unto the children of Israel.
So will be in the future for Israel,
Matthew 19:28 And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
but that is not the case for us as SaulToPaul already pointed out
Galatians 3:28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
Those who pose as priests today are 2 Timothy 11:13-15 KJV!
The last citation appears to be a typo...
But Revelation has the following:
Rev 5:10
And (He) hast made us unto our God
kings and priests:
and we shall reign on the earth.
Among its other gifts, Revelation gives us the future history of Christianity in every generation - eg the quality of Christian Life in Christ upon this earth. And this little passage would seem to be saying that the Lamb HAS ALREADY MADE us to be Kings and Priests upon the earth, BUT that we do NOT YET reign...
So we are now kings unto God Most High but we do not reign - eg rule over - the earth... And we are now priests unto God, and His Kings, and we SHALL reign on the earth... In the Age to Come...
So whereas kings without power will reign with priests on earth in the Age to Come, it does not say that priests have no ministry here and now.
Indeed Rev 20:6
Blessed and holy is he that hath part in the first resurrection:
On such the second death hath no power,
but they shall be priests of God and of Christ,
and shall reign with him a thousand years.
So it would appear that the priesthood of God we find in 5:10 is found by those who have taken part in the first Resurrection, the one in Christ, and these shall reign with God and Christ a thousand years - a long time - and at the end will be tempted one more time, and the second death at the last dread Judgement will have no power over them... eg Over such as these...
And all of this within the context set forth in the first chapter:
Rev 1:6
And hath made us kings and priests
unto God and his Father;
So we, who have a part in the first resurrection, are both kings and priests, here and now, in this life on this earth... Yet we do not yet reign over the earth... We are ONLY kings and priests unto God, and our rulership is heavenly, not earthly... Upon this earth, our reign is only over ourselves, barely, and that only through Christ and the Holy Spirit... Within the Body of Christ on earth... Communally...
"Drink of this all of you..."
So the question still stands - We ARE a Royal Priesthood here and now, those who have a part in the first resurrection - Paul himself spoke of this when he wrote:
Col 1:24
Who is now rejoicing in my sufferings for you,
and filling up that which is lacking
of the afflictions of Christ
in my flesh for his body's sake,
which is the Church:
To suffer for the Body of Christ with rejoicing IS the part taken by His Disciples of the first Resurrection, because it fills in that which is NOT YET the afflictions of Christ, and does so in one's own flesh, for the sake of the Body of Christ, which is the Church...
See how the words of that passage read?
A peculiar Royal Priesthood indeed!
Tested and purified in the afflictions of one's own flesh...
A spectacle to men and angels alike, as Paul says...
Arsenios