Why, then, does Rev 20:12 say that the book of life is opened at that judgement, and the dead are judged according to the BOOKS (plural), both the book of life and the book of death?
The judgement of Rev 20 is exactly the same as the judgment of Matthew 25:31-46, and it's crystal clear that not everyone at that judgement is condemned.
Beware of following the false traditions of men.
Are you "in Christ Jesus" or not?