I had always thought this was about The Stranger by Albert Camus. It's one of my favorite books and I see too many parallels for it to be a coincidence. Not in the mood to post a full analysis at the moment, but certain lyrics give it away.
"When the priest comes to read me the last rites
Take a look through the bars at the last sights
Of a world that has gone very wrong for me"
The Stranger has the exact same setting, of a man condemned to the gallows. A priest comes and tries to reform his "sociopathic" ways but is thrown out of the cell as Meursault suddenly feels empowered. He opens himself up to the "general indifference of the world" and smells the flowers outside. He had never truly lived up to this point, and he needs neither God nor anyone else.
"Life is just a strange illusion"
Camus' views on the absurdity of existence are eloquently portrayed in this line. Through the end, Meaursault is near not sorry, for his death is the most authentic and personal experience of his life no one can take away from him.
I could write more, but at a later time. BTW, 20/10.