He was slain by the sin of the world. {DA 772.2}

Expel sin from your hearts; for sin caused the death of the Son of God. {RH, July 22, 1884 par. 9}

So it IS Sin that causes the death. No sin, no death, same glory.

But no glory, no death. Simple.
"But if men cling to sin, they become identified with it. Then the glory of God, which destroys sin, must destroy them" (DA 107).
According to your view sin is not so bad, because it destroys itself (which is a good thing). But this is not what will happen.

Malachi 4 tells us that when the fires do come at the end, the sinners will be stubble. They are dead. Then the fires cleanse the earth? Why fire? Why burn up the whole earth if the sinners are dead? Why Green?

“Every battle of the warrior is with confused noise, and garments rolled in blood; but this shall be with burning and fuel of fire. “The indignation of the Lord is upon all nations, and his fury upon all their armies: he hath utterly destroyed them, he hath delivered them to the slaughter.” “Upon the wicked he shall rain quick burning coals, fire and brimstone, and a horrible tempest: this shall be the portion of their cup.” [Isaiah 9:5; 34:2; 11:6 (MARGIN).] Fire comes down from God out of Heaven. The earth is broken up. The weapons concealed in its depths are drawn forth. Devouring flames burst from every yawning chasm. The very rocks are on fire. The day has come that shall burn as an oven. The elements melt with fervent heat, the earth also, and the works that are therein are burned up. [Malachi 4:1; 2 Peter 3:10.] The earth's surface seems one molten mass,—a vast, seething lake of fire. It is the time of the judgment and perdition of ungodly men,—
673
“the day of the Lord's vengeance, and the year of recompenses for the controversy of Zion.” [Isaiah 34:8; Proverbs 11:31.] {GC88 672.2}

The wicked receive their recompense in the earth. [Isaiah 34:8; Proverbs 11:31.] They “shall be stubble; and the day that cometh shall burn them up, saith the Lord of hosts.” [Malachi 4:1.] Some are destroyed as in a moment, while others suffer many days. All are punished “according to their deeds.” The sins of the righteous having been transferred to Satan, he is made to suffer not only for his own rebellion, but for all the sins which he has caused God's people to commit. His punishment is to be far greater than that of those whom he has deceived. After all have perished who fell by his deceptions, he is still to live and suffer on. In the cleansing flames the wicked are at last destroyed, root and branch,—Satan the root, his followers the branches. The full penalty of the law has been visited; the demands of justice have been met; and Heaven and earth, beholding, declare the righteousness of Jehovah. {GC88 673.1}

We read of chains of darkness for the transgressor of God's law. We read of the worm that dieth not, and of the fire that is not quenched. Thus is represented the experience of every one who has permitted himself to be grafted into the stock of Satan, who has cherished sinful attributes. When it is too late, he will see that sin is the transgression of God's law. He will realize that because of transgression, his soul is cut off from God, and that God's wrath abides on him. This is a fire unquenchable, and by it every unrepentant sinner will be destroyed. Satan strives constantly to lead men into sin, and he who is willing to be led, who refuses to forsake his sins, and despises forgiveness and grace, will suffer the result of his course. {ST, April 14, 1898 par. 13}