One does not lose status. One loses life. That is why some sins are called "deadly". Remember the passage in 1 John about "sins unto death"?
1 John 5:16 If anyone sees his brother sinning, if the sin is not deadly, he should pray to God and he will give him life. This is only for those whose sin is not deadly. There is such a thing as deadly sin, about which I do not say that you should pray. 17 All wrongdoing is sin, but there is sin that is not deadly.
One does not lose status as a child of God one loses life. Like Eve and Adam lost endless life when they sinned. They did not cease being God's children, they ceased living. That is why death entered the world when they sinned.
Romans 5:12 Therefore, just as through one person sin entered the world, and through sin, death, and thus death came to all, inasmuch as all sinned — 13 for up to the time of the law, sin was in the world, though sin is not accounted when there is no law. 14 But death reigned from Adam to Moses, even over those who did not sin after the pattern of the trespass of Adam, who is the type of the one who was to come.
Natural death is the consequence of death through sin. That is why death has a sting to it. As saint Paul wrote "the sting of death is sin". A child can die. And Hebrews 6 tells how that happens
Hebrews 6:1 Therefore, let us leave behind the basic teaching about Christ and advance to maturity, without laying the foundation all over again: repentance from dead works and faith in God, 2 instruction about baptisms[a] and laying on of hands, resurrection of the dead and eternal judgement. 3 And we shall do this, if only God permits. 4 For it is impossible in the case of those who have once been enlightened and tasted the heavenly gift and shared in the holy Spirit 5 and tasted the good word of God and the powers of the age to come,
6 and then have fallen away, to bring them to repentance again, since they are re-crucifying the Son of God for themselves[d] and holding him up to contempt. 7 Ground that has absorbed the rain falling upon it repeatedly and brings forth crops useful to those for whom it is cultivated receives a blessing from God. 8 But if it produces thorns and thistles, it is rejected; it will soon be cursed and finally burned.
And that is how a person's name is blotted from the Lamb's book of life.
Revelation 22:19 And if any man do away of the words of the book of this prophecy, God shall take away the part of him from the book of life, and from the holy city, and from these things that be written in this book.
And the warning is not in Revelation alone nor is it a new thing unheard of before God warned of the same thing in the Hebrew scriptures
Exodus 32:21 And Moses said to Aaron, “What did this people do to you that you have brought a great sin upon them?” 22 And Aaron said, “Let not the anger of my lord burn hot; you know the people, that they are set on evil. 23 For they said to me, ‘Make us gods, who shall go before us; as for this Moses, the man who brought us up out of the land of Egypt, we do not know what has become of him.’ 24 And I said to them, ‘Let any who have gold take it off’; so they gave it to me, and I threw it into the fire, and there came out this calf.”
25 And when Moses saw that the people had broken loose (for Aaron had let them break loose, to their shame among their enemies), 26 then Moses stood in the gate of the camp, and said, “Who is on the Lord’s side? Come to me.” And all the sons of Levi gathered themselves together to him. 27 And he said to them, “Thus says the Lord God of Israel, ‘Put every man his sword on his side, and go to and fro from gate to gate throughout the camp, and slay every man his brother, and every man his companion, and every man his neighbor.’” 28 And the sons of Levi did according to the word of Moses; and there fell of the people that day about three thousand men. 29 And Moses said, “Today you have ordained yourselves[a] for the service of the Lord, each one at the cost of his son and of his brother, that he may bestow a blessing upon you this day.”
30 On the morrow Moses said to the people, “You have sinned a great sin. And now I will go up to the Lord; perhaps I can make atonement for your sin.” 31 So Moses returned to the Lord and said, “Alas, this people have sinned a great sin; they have made for themselves gods of gold. 32 But now, if thou wilt forgive their sin—and if not, blot me, I pray thee, out of thy book which thou hast written.” 33 But the Lord said to Moses, “Whoever has sinned against me, him will I blot out of my book. 34 But now go, lead the people to the place of which I have spoken to you; behold, my angel shall go before you. Nevertheless, in the day when I visit, I will visit their sin upon them.”
There is a theme all through the holy scriptures warning that certain sins do in fact kill and the death that they inflict can lead to erasure from the book of life.