Unbiblical and silly?? When we take the bible as a whole, it's always been life or death. What's silly is not taking to heart Christ's words when he calls the Lake of Fire "the second death"
Even one of the most quoted verses in the bible supports it -John 3:16 which proves only one gets everlasting life. The other perishes. It does not state the other gets eternal life in hell. But again, if we want to believe death does not mean death than one can believe anything.
Christ's words in Matthew 10:28 totally supports the words in Malachi-
Malachi 4:1 "For, behold, the day cometh, that shall burn as an oven; and all the proud, yea, and all that do wickedly, shall be stubble: and the day that cometh shall burn them up, saith the Lord of hosts, that it shall leave then neither root nor branch."
That's what a fire does.
To suggest there's no support in the bible for the body and soul being "fully" (the Greek) destroyed in the Lake of Fire is untrue. I mean, it is called the "second" death for a reason.
I will state I don't believe there's any evidence to support Universalism -just the opposite.
So 3 beliefs -we shall all see in the end....