Jesus died for all of our sins- but that’s a lot of Jesus to be divided up. Meaning that each individual will be left with a small fraction of Jesus. And with new people being born constantly, that fraction will be decreasing. Slaughtering people would free up some Jesus to be reapportioned among the survivors; but murder, being a sin, will increase the amount of sin to be Jesusified. And then the sins that the slaughtered people won’t be doing on account of being dead must be subtracted. The math gets messy.

So I think this Holy Spirit thing has to be a fudge factor, some hypothesized dark matter to make things zero out. And that’s a sloppy way for sins to be accounted for.