Because the alternative is worse than your worst nightmare.<quoted text>
And why should we believe that verse? Or, for that matter, any verse in your mythical text?
"the lake of fire" "tormented" "forever"
Revelation 20:10 (NKJV)
10 The devil, who deceived them, was cast into the lake of fire and brimstone where the beast and the false prophet are. And they will be tormented day and night forever and ever.