I'm not Catholic and I have a bit of confusion over this. Where does it say in the New Testatment that praying for the souls of the dead will have any impact on God's Judgement of them?
Well, Rebel, I'm Catholic but do not possess the best memory on the source of that teaching, in spite of aving read a book on it about one year ago. Sorry for the non-informative reply - I'd rather do some research than give you my meandering best guess. It may well derive from the "living Word," - the one you hear from the pulpit and we hear in our Church doctors and Church history. Not the answer you might want, maybe.
"Save yourself!" they mocked...
That is why we have the bible as the word of God...It cannot be changed or manipulated as can man's words.