Girl, Are You On Your... lyrics

I took this as a massacre. Curtains can represent new beginnings (openings) or endings
i promise this wont hurt a bit can be referring to obviously killing someone
pray to your god and forgive me and forgive me father for i have sinned to me seem more plausible when it comes to killing someone than raping them... Unless they are referring to a priest. The streets will run red... Obvious
no one knows what goes on behind closed eyes refers to death. Eyes close when you die (eyes are often declared the portal of the soul) and no one knows what goes on when you die. Highlight this valley is a referrance to the valley of death mentioned in the bible. "though i walk through the shadows in the valley of death i fear no evil"
to highlight the valley would rid it of shadows, meaning clarity in the decision to kill. The fire will burn us both... Hell fire