There is nothing so worthless as a glib confession of sin.  It uses “I am a sinner” with no more meaning than “I am a human”.  These shallow confessions are often laced with a false humility; they can even be a cloak for self-righteousness.  This kind of confession has no desire to get on its face in abject humility; it has no desire to look in the mirror at anything specific in their lives that needs to be dealt with fully and completely; it is very content to offer a general confession that alters nothing in the heart and behavior. 

“Whoever conceals his transgressions will not prosper, but he who confesses and forsakes them will obtain mercy.” (Proverbs 28:13 ESV)