Since the RCC teaches essentially a works-based gospel, there is much reasonable debate about whether or not Catholics are in the body of Christ at all. And this IS the exact point of view of the site administrator.
I do believe that professing Catholics can be saved, and that "professing" protestants can be lost... however, in a church like the RCC where the gospel is obfuscated by works, legalism, and all manner of ritual... it seems like a bit of an uphill swim for them to find a clear rendition of the gospel to believe in.