I think we are misunderstanding each other here. I don't see that anyone here has said that works save you. I don't see any disagreement on that point from anybody, not Reanne, not Rusty, nor Jack Williamson, Glomung, or anyone else. What I see being said is that a faith which produces no fruit is a dead faith in which no transformation has taken place. A living, transforming faith will result in changed thinking and behavior. If a person's thinking and behavior are the same after their profession as it was before, then there is good cause for them to question their salvation. God's grace goes beyond bookkeeping, IMHO. It is not merely God saying, "Well, Jim just said the magic words. Go erase the record of his sins and put his name in the Book of Life. Put his name on the mailbox of that dwelling place on Gold Street. Ha ha! What am I saying, they're ALL Gold Street!" When a person places their faith in Christ, Christ comes and indwells him, making his dead soul come alive. A change takes place within the person's very being and that, naturally, is going to result in changed thinking and behavior.
Faith alone (or, as Dirty pointed out, Grace through faith) does save. Works never saved anyone. I would venture to say that we all agree on those two points. However, there is a dynamic relationship between the two. When I prune my trees and shrubs, I can tell which branches are dead and which ones are alive. If I have any doubt, I can wait another season, and by the next spring, there will be no question. The living branches will put out leaves because that's what branches do. They may be small leaves, they may be sickly leaves, but I know that that branch is alive. In the Fall or Winter, I may not be able to tell, but in the Spring, when the sun shines and the rain falls, the living branches respond with foliage, flowers, and fruit.
It is not our duty, as several of you have already pointed out, to decide whether another person is saved by our own arbitrary standard. But, it is well for us to examine our own lives and if our desires, attitudes, and behavior are carnal, we are well justified in being concerned about our salvation. If it appears that the old man is the lively one and the new man seems to be inert and unresponsive, that doesn't fit any Biblical pattern of regeneration, salvation, or Christian living that I can see.