Catholicism: "Our Teachings have never changed" claim

[CapnAwesome]

Hi guys

So..Yeah, I'm new here, and I was hoping one of you might know something that could help me out. I've been looking around but eh...90% of Theology/Church history sites are biased between one group of biblethumpers or another trying to paint the other as silly/moronic/satanic/whatever. I'm looking for an outside opinion.

Much as it might amuse some of you I'm actually an RE student and I've been pulled into a debate with a Catholic. Now, I've got a pretty good handle on what Catholics think about the world but I'm no expert on Catholic Church history. One of the things this guy is insisting upon is that the Catholic Church has at no point ever changed one of its teachings, doctrines or Dogmas, same today as it was a thousand years ago.

I've mentioned a few things across history that I know of like the sin of Ursury being abolished/"reinterpreted" (lending money with interest), the heretic popes Virgilius and Honorius, the idea that all non-Catholics are going to hell (rethought during vatican II) and the idea of Limbo vanishing but he's having none of it; these aren't infallible teachings and don't count.

I honestly thought some of Virgilius's statements could be counted as infalliable but either way...Do any of you guys know anything I could reference or refer to? Any tips are appreciated.

Vox

That's a crazy claim that he's made. I was raised Catholic and the Catholic Church openly has changed their positions. It's not like it's some sort of secret or anything.

Vatican I: http://en.wikipedia.org/wiki/First_Vatican_Council
Vatican II: http://en.wikipedia.org/wiki/Second_Vatican_Council
The council of Trent: http://en.wikipedia.org/wiki/Council_of_Trent

A very obvious change in Catholic theology that came out of Vatican II is the ability of non-Catholics to go to heaven. However lots of other doctrines came out of the others as well, including papal infallibility and the divinity of Mary. Basically your debate opponent doesn't know what he's talking about. I don't know why someone would even make such a claim, as the Pope himself acknowledges and even makes doctrinal changes, such as post Vatican II when John Paul II said that Jews could enter Heaven, which certainly wasn't Catholic policy in the middle ages. I don't know where he would get that claim from.