Indeed they do believe they are justified by grace..but they have to keep it with works and sacrament.. once justified it is their to lose, and the only way to keep it is the RC church
And that idea isn't just held along denominational lines either.
Specifically as to RC theology, I'm not knowledgeable enough to speak with any certainty or authority. I have to follow along with the CCC and then ask questions of RC canon doctors to get clarification.
My best understanding about working to “keep” salvation is that that isn't exactly correct. Salvation is not “chancy”. What RC theology, along with some Protestant as well, is addressing is the body of Bible passages that speak to these things such as apostasy, shipwrecked faith, castaway, and other “dire” warnings in Scripture, especially the New Testament.
I as a conservative, Calvinistic tending, Christian have to admit that there is a tension in Scriptures that doesn't let us take salvation for granted.
And I think that is what is being addressed, but it is a matter of subtle distinctions and that there are lots of misunderstandings about RC theology. I know from my own experience that there is an anti-RC bias that just exists and myths are passed on to succeeding generations without ever being examined.
The part about the only way to be and stay saved being by the ministry of the Church is absolutely correct and that's where I part ways with them. However, in the CCC there is a hint that salvation exists outside those channels, but it's slim.