Sorry Justin I've been busy preparing for my week in Perth (flying tomorrow) and can't answer you just now.
For those posts since though:
1. "The bible is the most revised text in history". Nope, wrong. The composition of the Bible was settled at one of the earliest ecumenical councils (can't remember which off the top of my head) and in the 1600 years since the contents have not changed. However, in finding excuses to break away from the Catholic Church, the Protestant reformers claimed that the Catholic Church did not have the authority to determine which books would be in the Bible. This was the claim made by Martin Luther to justify the removal of certain sections of the old testament which did not comply with his personal theological teachings (such as sola fide).
Justin has a much better grasp of things when he says that the Quran has been just as constantly reinterpreted - though the actual text of the Bible has never changed (translations notwithstanding - there will always be a better way to translate something) various interpretations have over time given way to deeper ones. However, according to the Catholic Church, once an infallible teaching is decreed (either by the Petrine authority or the by the authority of an ecumenical council) it can never be revised. This is due to the understanding that the dogmatic teaching (as opposed to simple disciplines) of the Church are divinely protected from error and thus infallible. Teachings may be and often are built upon at a later time, by further councils, discussions and pronouncements, but they have never been and never can be repealed.
2. "Nobody listens to the Old Testament anymore". This is also a gross misunderstanding. The Old Testament is included in the entire Bible because it always was and always will be Sacred Scripture. However, it is not the "rule of life" that the New Testament has become because it was only the first act in a two-part play. The Old Testament is all about the Covenant between God and Man, and how He sets us up for salvation. Part II of the story, the New Testament, shows us just how He pulled it off, and rather than replacing the old beliefs fulfils them. We can also see a progression in humanity's understanding of God, first as simply the jealous, all-powerful ruler of the cosmos, later to the just master who generously rewards fidelity, to the mighty saviour of his chosen people (the Hebrews, with whom he made his Covenant) and finally the supreme revelation, that God is in fact merciful and loving, and desires redemption for us His children. It is for this reason (that the New Testament gives us a more total revelation of God and His desire for humanity) that the Christian no longer observes the Mosaic law (which was established as a compromise, a simplification of the divine Will) and instead attempts to live according to the teaching and example of Jesus, the Christ.