Real faith produces real change in a life.  Paul, in writing to the churches in Galatia, bring forth this foundational truth:  we are saved by faith alone in the work of Jesus on the cross for us.  We can't add to it by our works.  We can't change it to our preferences.  We simply accept it and live in it.  Jesus is enough to save me and change me.  There is no other gospel and no other Savior!