I agree with your challenge to the witness. Let's evaluate the consistency of this person.
The title of this opening post connects works to salvation.
You offer a sound scriptural challenge it's Romans.
This person replies by downplaying the connection of the Opening Post title with a deceptive wording. They say "We are not saved because of our own merits", but they go on and bold the word work with deeds and connect it to Revelation 22, which specifically divides the saved from the unsaved.
What this means is that this is a very dangerous witness that is either confused about what they are teaching, or that they know, believe it and are willing to deceive people into moving away from Jesus and onto the baby bottle nipple of their false prophet.
"Charity...believeth all things."
In other words, gives the benefit of the doubt.
I tend to follow that even while disagreeing with one person or another.
The conclusion that a person is up to no good going into a thing, just because they may appear to be, is not one I take lightly.
I've met too many well intended people who simply did not know better, no matter how long they had been at a thing, or how often their error was pointed out to them.
Others - it is much more obvious they do not follow their conscience on one thing or another, no matter how much they assert otherwise.
That too is a kind of blindness on their part, in some.
It is ever fascinating what one person or another thinks he or she believes, despite the obvious.
Reminds me of a Jew I was witnessing to yesterday.
When I explained to him the meaning of the words "Father forgive them for they know not what they do" he related that had been the first time he had heard that in a way that did not make him out the enemy of that that most Christians he had ever dealt with appear to have made his people out to be.
What if I had merely dealt with him on the basis of all his people's willful rejection of the Saviour due both to their learned, handed down ignorance, too often reinforced by our own?