Sorry, but that isn't in Scripture. You're confused, as usual. Scripture states that the dead are in hell and will be raised to judgment and then be thrown into the Lake of Fire. Even the spirit of hell will be cast into that lake, to be tormented by flames for ever and ever. If it doesn't destroy Satan, hell, the beast and the false prophet but only torments them forever, what makes you believe that it will destroy other created beings? Why can't you just believe what The Bible says? Are you merely ignorant?
Why not just read it
accurately?
What makes us believe everyone but Satan, the Beast, and the False Prophet are destroyed in the Lake of Fire?
1) It never says the rest suffer for eternity. That in itself is enough since the burden of proof is on you who are promoting such a radical and horrific idea that God punishes non-Christians forever. It's up to you to prove your proposition first then we can disprove it if you can even demonstrate what you believe is what's taught in scriptures.
2) The nature of God, as taught us by scripture, and our own personal experience with a loving God, compels us to believe God would never allow any person, no matter how wicked, to suffer for eternity. The case for God's goodness and his justice is so great that we would rather conclude the Beast and the False Prophet represent something other than people, like religious systems, than to believe they represent people like you
assume they do. To interpret scriptures as you do is not to harmonize scriptural revelation about God and what he would do.
3) You have to assume a lot of things about Revelation to get your interpretation:
a) The Beast & False Prophet represent individuals. That's an assumption, not a fact.
b) The events in that chapter represent what happens in the afterlife. That's an assumption, not a fact. They could represent judgement for people alive on earth, and if you understand apocalyptic literature you know that's a valid way to look at it.