Hi deputy Dog
You are mixing two different things.
I have faith in Jehovah and the assurance of salvation through his underserved kindness covering over my imperfection that I simply cannot earn.
But works is separate to this. Jesus and the apostles knew that there would be many people in this time "having a form of Godly devotion" but it will prove false and how do we recognise these? They say they have faith by word but their "works" do not show this in truth.
True Faith inspires works! faith in God's salvation would make it impossible for you not to preach and hope his words saves others as it also reached you.
People that deny "works" are simply realising the inherent lack of faith in themselves knowing it does not push them as it should if it was real faith. But that is between themselves and Jehovah.
At Armageddon (time of the end) the difference between those with true faith in Jehovah and his son's sacrifice and those that have a false faith will be marked and simply by if their works matches what is coming out of their mouths.
Why would a person accept fornication, adultery, idolatry etc if it is unpleasing to their God? They would be fighting against all things unpleasing to God and doing his will because their Faith in Jehovah inspires them towards repentance and righteousness rather than wallowing in sin.