I don't have the theological training to answer your question. However, as an uneducated lay man, I get a bit nervous about definitive statements like this, wiping out an entire slate of the nominal Christian church from Christianity.

From my basic understanding, I think Roman Catholicism as a creed makes it very difficult for its adherents to genuinely grasp the Gospel (it ties in too much emphasis on works and tradition, for a start). However, the membership of that church is not as homogeneous as you might think and, based on conversations with many Roman Catholics over the year, I believe there are some who have a saving faith in Christ.

I now defer to those much better qualified to comment than I am.

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Jon
London, UK
Ex-Redeemer PCA, Manhattan
(Now All Souls' Langham Place, London)