Why? Because he believes in the lord? That doesn't make you a better person.It takes a superstitious person to believe in either the devil or God. At least the God Johnny's talking about.
Johnny was an alcoholic womanizing musician. Perfect guilty person who falls for religion because he's guilty and ignorant.
nothing wrong with being inspired to be a better man and recognizing there is a greater power in the universe, bigger than you and your destructive narcissism... johnny cash was certainly a better man than a scumbag like you.