NOT a Christian song. "Jesus" is used in a loose cultural/pondering way here.
It's a heavy, sad song.
Something about being "trapped in this body", "skin and bones", "I was a good son" and "Why have to forsaken me Jesus".
I'm pretty positive that it's a very popular, well known song and not something extremely obscure, though the fact that a rigorous Google search is turning up nothing has me unsure.