From what I can tell, this is about someone who was hurt badly by another they trusted, and blamed themselves (something that you did will destroy me, something that you did will stay with me), plus the offender. "If holy is as holy does, this house would burn staight down to hell," implies that if this person truely said or confessed to what they were doing, they'd be damned, and because they're not confessing, no one will believe it happened (If God's my witness, God must be blind). It's pretty much an anger rant and the feelings of betrayel and disgust all jammed into one.
From what I can tell, this is about someone who was hurt badly by another they trusted, and blamed themselves (something that you did will destroy me, something that you did will stay with me), plus the offender. "If holy is as holy does, this house would burn staight down to hell," implies that if this person truely said or confessed to what they were doing, they'd be damned, and because they're not confessing, no one will believe it happened (If God's my witness, God must be blind). It's pretty much an anger rant and the feelings of betrayel and disgust all jammed into one.