Ah, yes, then I agree with you that there is no “widespread” dogma. I understand that you were asking if there were no individuals who said that — unfortunately there are many on FR (their numbers in the real world seem minuscule) who call us as damned. Unfortunately the rest of the non-Catholic crowd doesn’t haul these guys up, so most of us get the erroneous impression that ALL of you guys think that way...
Even this person was only claiming that being a Catholic in some sense, doesn’t guarantee you’re a Christian. With some differences about where the boundaries are and what defines them, such as rites of confession after having sinned a serious sin, I understand the Catholic church would actually agree about that.