[quote=JimG]Catholicism considers itself to be the fulfillment of Judaism. Judaism expected a Messiah. He came, and fulfilled the Old Covenant, extending it to all the world through the Church.
So even though the Catholic Church has a 2000 year history going back to the time of Christ, it really has more like a 4000 or more year history going back through the Prophets, to Abraham, Melchisedek, Noah, Abel, all the way back to Adam and Eve. It is a continuity. Catholicism accepts the books of the old testament plus the books of the new testament.
Islam accepts only the Quran, and the one prophet Muhammed. It says it accepts the old testament prophets, and Jesus as a prophet, but in fact it accepts only those parts of the old testament (and new testament) which support the teachings of Islam, which is darn little. Everything else is considered corrupted.
So in essence we have a stand-alone religion dependent on one man and one book whose reliability cannot be established.
This is pretty much the same as what Mormonism claims. One man who is considered to be the last prophet—Joseph Smith–and one book, the book of Mormon. If we are going to go by whichever prophet comes last, Joseph Smith would have the better claim.
For my money, it was St. John the Baptist. He was the last prophet.