Hi!
Rev 20:15 And whosoever was not found written in the book of life was cast into the lake of fire.
These people will simply say that when they are cast into the lake of fire they are burnt and stop to exist.
Look at this:
Rev 19:20 And the beast was taken, and with him the false prophet that wrought miracles before him, with which he deceived
them that had received the mark of the beast, and them that worshipped his image.
These both were cast alive into a lake of fire burning with brimstone.
This sounds like only the beast, the false prophet and those which had received the mark end up in the lake of fire. But what about those which died before and did not receive the mark but were also unbelievers?
Rev 20:10 And the
devil that deceived them was cast into the lake of fire and brimstone, where the
beast and the
false prophet are, and shall be tormented day and night for ever and ever.
And this verse here sounds like only the devil,the beast and the false prophet will end up in the lake of fire where they are tortured forever.