For a Guy purportedly trying to bring salvation to humanity, some Jesus's followers do seem to relish opportunities to keep the everyone they can out of the Kingdom.
Sometimes I put on my 2edgy4u atheist cap and needle my lapsed-Catholic wife with that notion. It looks like a duck and a quacks like a duck, call it veneration if you like -- it's still a duck. And I do point out that there's nothing wrong with that. Given the choices I'd rather worship a once-mortal mother goddess than a tripartite sky-father who spends most of the book being terrible.
But, from outside, they appear to be at least half right.
The catholic church seems to be less CHRISTian and more ... Trinity-ian. I assume it's a fairly large difference on the ground as one is all about a single person, born a regular man, who brings forgiveness for unintentional sins. The other, a story about a much more conscious god who manifests himself in a young body and proceeds to lecture on morality and the afterlife.
Any Catholic still saying that today is going against the Church.
But, at the same time, Catholic tradition has always maintained that even most Catholics end up in Hell. There's even biblical support for the idea in the "wide"/"narrow gate" language of the Gospels.
So, if Catholicism is the one true Faith, and even most Catholics end up in Hell, why would anyone reason that those outside of the one true Faith have good odds?
https://www.catholic.com/qa/do-non-catholic-christians-go-to...
edit I'm apparently somewhat misremembering things, and any non-catholic without a mortal sin has a supposed chance, but I still would say that rules out all non-catholics.