Saved by grace alone?

It is perhaps time for me to use this Blog again and see if I can stir up a bit of discussion and debate.

Let me put a provocative question - "If a person thinks he or she is saved by putting his or her faith in Jesus Christ as their personal Saviour, is it possible that they are trusting in something they have done and therefore have something in which to boast? (Romans 4:2)

This being the case, they are not saved by grace alone. They have turned faith into a work. But salvation is ALL of grace!
This is not meant to be a trick question. I have a genuine concern for those who are convinced Arminians, who believe that their "decision for Christ" is the ground of their salvation.

Your comments invited.
Frederick