We seem to have a confusion on what faith really is, and how it works.....
Lets take a look at one of my favorite chapters on faith, Hebrews 11.
Notice the pattern, they By faith, then did some work or deed. The work or deed was done from, and by faith. It was not done one its own, It came from the faith, Faith as it were is a well that we can draw the good works from.
You see we are justified by faith first. THEN the works come. You see if you do not have faith, and your works will be empty, have no life, be dry. If you have faith but do not do anything with it, its not really faith, its only belief and easily turned to unbelief by the merest whim or even the thought of putting any action to the faith.
So if you have faith, you are justified. Being Justified, you will as a byproduct do good works, as God is making you a new creature. As you are a new creature your very behavior will show the change from old to new. You see its not just the faith but the life change that Christ works as you let him.