Exactly, Martin. How can I know the exact number? Besides, the saved people that comes out of great tribulation, that is the subject of your question, knows they have not been chosen personally before the foundation of the world to be saved. They are those who refused to identify with the Satanic government of those days by being marked with the logo that would damn them to hell and have not loved their lives unto the death and the vast majority have had their heads removed from their bodies for their stand.How come you have numbered the great crowd of Revelation 7 that no one could number, and decided that is makes 1.2 million?
But, to move into your context I do know why the number cannot be known by a man. It is because the slaughter of these saints is very great but it is on going and God has not published the exact number when he wrote the prophecy. I will underline how I know it.
7 And when he had opened the fourth seal, I heard the voice of the fourth beast say, Come and see.
8 And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth. (a fourth part of 8 billion is 2 billion)
9 ¶ And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held:
10 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
11 And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled.
At the end of the time, they will be resurrected.
Re 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.
Now, I have a question for you. Why did you, who will believe nothing I wrote from the Revelation above is literal, ask me a question that assumes the passage you referenced from Revelation is literal?