St. jimmy and jesus of suburbia question ?!?

i know that jesus of suburbia is like a fictional character of green days that partially tells billie joes life and the punk guy whos life sucks and is like a runaway and stuff and when he cuts his hand and makes a handprint and writes "st jimmy" on the bathroom wall . So is that like his new way of things ? is he now the st jimmy ? or is it like him in a time of change ? I am a huge green day fan and i wanna know this real bad so thanks ! :D