@Godbeliver
Yes, Jehovah’s Witnesses have stated billions will perish at Armageddon. In fact they have written that 99.9% of mankind alive at the end will be destroyed eternally. To them, only Jehovah's Witnesses have a scriptural hope of surviving Armageddon.
Thank you for questioning my beliefs. First I believe the Bible is the word of God from cover to cover., that there is only one class of Christian, that the 144,000 symbolically represent the innumerable great Crowd of believers.
So here is how I understand what the scriptures teach concerning eschatology.
Firstly, I see 1914, 1918, and 1919 as bogus and only serving to distract from the gospel by adding to it unnecessary elements to and requirements for salvation.
Since I see Armageddon is a thing of the past, I believe in and have a hope for the resurrection of all mankind, both the just and the unjust. This is because Christ died not only for the church, but for every person who has ever lived since and including Adam.
At Christ's Second coming, the just will be raised immortal and given a body like unto His glorious body. Their destiny includes reigning over the nations in Christ's kingdom during the millennium.
The unjust will face Christ in their sins and will experience both punishment and judgment. Severity of punishment will depend on circumstance and knowledge....but every evil deed, and word spoken will be brought to light.
All those of mankind, who have not sinned against the Holy Spirit will be ruled with a rod of iron during Christ's reign. Satan will be released at the close of the thousand years and and all those siding with him will be cast into the lake of fire..I.e., destroyed eternally.
Finally, all sin and suffering and death will be eradicated and the new heavenly Jerusalem will descend to the new earth and God's dwelling place will be with man in perpetuity.
Christ is going to win big time. He will draw all men unto himself and we will forever be with the Lord.
As for who has sinned against the Holy Spirit, I will leave that to the one who alone can read the hearts of men. I Chron 28:9, Revelation 2:23