No, that is the teaching of Catholicism.
They call non Catholic Christians "incomplete brethren."
They are always saying "come back to the mother church" and are taught that no one can be a true "completed" Christian unless they join the Catholic church. (Contrary to what is taught by Jesus and the scriptures.)
At least some Catholics (very few from my observations) now understand that there are Christians out side of the Catholic belief system.
Some seem to put more faith in their denomination than in Jesus
It is certain that they believe that there is NO salvation outside of the catholic church! Furthermore, if you claim that you know you are saved, then you have committed the “mortal sin of presumption” and you go straight to Hell when you die, (no purgatory for you,) unless you confess it to a priest and receive absolution.