Is it safe to assume that you hold the same opinion of the current Pope? "He offended members of other faiths in 2000 when he signed a document which argued: "Only in the Catholic Church is there eternal salvation." http://www.nzherald.co.nz/index.cfm?c_id=500818&ObjectID=10121456
Why don't you read the whole document, instead of just the NZ Herald write up? It's call Dominus Iesus and can be found on a google search or even an FR search.
(1) That quoted sentence is completely made up and found nowhere in the document.
(2) He didn't just sign the actual document, he wrote it.
(3) You're more than welcome to read the document yourself instead of relying on a journalist's misquote.
(4) Chapter VI of the document addresses the question in great detail.