The Man Comes Around

There's a man going around taking names,
And he decides who to free and who to blame.
Everybody won't be treated all the same.
There'll be a golden ladder reaching down
When the Man comes around.

Johnny Cash's The Man Comes Around is an intriguing mix of half talking/half singing that is recognizable to a lot of people -- at least in its opening lines, "There's a man going around taking names, And he decides who to free and who to blame." It has numerous biblical references which leave me wondering exactly what Johnny believed and what he meant. Generally it must speak of the judgement day, but specifically I'm not sure. 

What do you think?