So why is it, in Revelation 20:4, it's no one who is still physically alive that is in view, but it is only someone that has already physically died that are in view? Maybe you can point out in the text, but I don't see a single mention of any saints in that verse, pertaining to the first resurrection, where that is being applied to them before they have even physically died.
John is given a vision of the souls (living spirits) in heaven. In life they were born again, partaking of the resurrection of Christ; i.e. the first resurrection, so in death as spirit body they went to be with the Lord in heaven. The fact that John sees only martyred believers in heaven, does not mean that all believers from earth after death will not join them.
Revelation 20:4 And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
These that John sees have already physically died. John is not seeing anyone in this verse that hasn't even physically died yet. If you disagree, point them out in this verse.
That's because John is only seeing those martyred in heaven. But the passage does not limit the number that will be in the Kingdom of Heaven to only them. The destiny for all believers is spiritual in Heaven after they have died on this earth. Saying "they lived and reigned with Christ a thousand years", shows that during this time likened to a thousand years, all believers after physical death live and reign with Christ throughout the Gospel Age. It could be literally from the first day of this symbolic time, like we find with the death of the thief on the cross (Today thou shalt be with Me in Paradise), or the last day of this symbolic time likened to a thousand years. The actual number of days, months, years matters not, for whosoever has part in the resurrection of Christ in life, in death will live and reign with Him for a thousand years. Or during this time likened to a thousand years. Living and reigning anytime within this age is living and reigning in this time from the first Advent of Christ to the end of the thousand years.
The text says---and they lived and reigned with Christ a thousand years. who? These martyrs, obviously. But that is meaning after they have been martyred, not before they have been martyred, and that 'lived'(zao) is meaning because of the first resurrection, as in lived again. If you disagree that zao can be applied in that manner, then you have to also agree it can't be applied in that manner per the following either.
Revelation 2:8 And unto the angel of the church in Smyrna write; These things saith the first and the last, which was dead, and is alive(zao);
Per this context, which came first? First He was dead then He became alive? Or first He was alive then He became dead? Obviously the former. After being dead how did He become alive, then? Obviously from a resurrection. The point being, in Revelation 2:8 (zao) means to live again, and that's exactly what it means in Revelation 20:4 as well.
Yes, zao means to live again. But living again is not what John says. John sees believers, who were martyred for their faith ALIVE in heaven. It does not say, but I suspect John was filled with joy at seeing these faithful saints ALIVE in heaven after their bodies had died on earth. What joy to fully comprehend the words Christ spoke when He was alive. Now John knows and understands that physical death is not to be feared by Christians, because death of our body simply means we go to Heaven to be with the Lord as living souls.
Christ spoke truth when He said
John 11:26 (KJV) And whosoever liveth and believeth in me shall never die. Believest thou this? And Paul too when he said
2Co 5:8 We are confident,
I say, and willing rather to be absent from the body, and to be present with the Lord. and:
Php 1:20 According to my earnest expectation and
my hope, that in nothing I shall be ashamed, but
that with all boldness, as always,
so now also Christ shall be magnified in my body, whether
it be by life, or by death.
Php 1:21 ¶ For to me to live
is Christ, and to die
is gain.
Php 1:22 But if I live in the flesh, this
is the fruit of my labour: yet what I shall choose I wot not.
Php 1:23 For I am in a strait betwixt two, having a desire to depart, and to be with Christ; which is far better:
Php 1:24 Nevertheless to abide in the flesh
is more needful for you.
1Co 15:44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
1Co 15:45 And so it is written, The first man Adam was made a living soul; the last Adam
was made a quickening spirit.
1Co 15:46 Howbeit that
was not first which is spiritual, but that which is natural; and afterward that which is spiritual.
1Co 15:47 The first man
is of the earth, earthy: the second man
is the Lord from heaven.
1Co 15:48 As
is the earthy, such
are they also that are earthy: and as
is the heavenly, such
are they also that are heavenly.
1Co 15:49 And as we have borne the image of the earthy, we shall also bear the image of the heavenly.
1Co 15:50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
The Kingdom of God that flesh and blood cannot inherit is the Kingdom of Heaven. Because when believers body dies, as spirit body we go to be with the Lord in heaven until our body is raised on the last day. Then the Kingdom of God in Heaven will come down from Heaven with the Lord with resurrected incorruptible and immortal body to be re-united with our eternal spirit or living soul.
This truth is confirmed for John and for us when we read of these martyred souls ALIVE in heaven, just as Christ promised we would be.
Joh 14:2 In my Father's house are many mansions: if
it were not
so, I would have told you. I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am,
there ye may be also.
Joh 14:4 ¶ And whither I go ye know, and the way ye know.