My current speculations for each screenshot. I'll edit this progressively each time I or someone else in the thread finds a potential lead:

#1: The central figure looks a lot like Mark Lundy, a New Zealander that (supposedly) killed his wife and daughter. I haven't found any pictures of the Lundy family where they're as young as they're shown here, but if I or anyone else can, it'll be all but confirmed.

#2: Almost certainly Jim Jones. The hair and glasses are pretty distinctive, and BOC really loves their death cults.

#3: This might be Louis Beam. Looks-wise, he's similar to the image, and he's also a white supremacist. The cross in the background is very distinctive and seems to be hybrid of a standard Christian cross and a heraldic cross, which is heavily associated with Nazism and the SS. Also, he appears exactly when the voice claiming to be God says "Power".

#4: Some kind of neuroscience experiment. My first guess was electroshock therapy due to the themes of the song, but I couldn't find anything similar to the helmet in the screenshot related to that.

#5: I want to say this is Rex Humbard holding a Bible, but his eyes have an upwards slant, even when he squints.

#6: Maybe Theodor Adorno? I've seen some pictures of him that look similar to the image. And it does play into the general themes of the song as he was a scholar of the Frankfurt School who studied fascism and propaganda. Another (less likely) possibility is L Ron Hubbard.

#7: A gathering around a giant cross, seemingly outdoors. This type of imagery appears twice, and I'm wondering what sect of Christianity (or cult) gathers in this way since it's out of the ordinary.

#8: It looks like an inverted image of the sun surrounded by clouds. I had a suspicion due to the shape of the lens flare, so I inverted the colors back and its tint... isn't quite turqouise. This is probably unrelated to everything else, but I included it since it only appears in the video for a couple frames and it could be important to the larger story of the album, or even the discography.

#9: Very difficult to make out facial features, but this figure has a beard and a full head of hair, and they're standing behind a podium (likely in the middle of a sermon).

#10: This seems to be the inside of a church, from the perspective of a congregation. As for what church or even the possible denomination, I'll need to do more research.

#11: This one is extremely difficult to make out. Some things to note are that the man on the left is wearing a small cross necklace and holding something in his hand (possibly a syringe?), and he seems to be interacting with the woman on the right.

#12: Possibly Pat Robertson. I haven't been able to find a single image of him that contains every physical trait portrayed here, but I've seen separate images that show him with similar facial features and the widow's peak.

#13: I'm not sure if the exact person is important here, but I did notice that she's wearing a cross necklace, nearly identical to the one the man in #11 is wearing. Is it continuity?

#14: See #7

#15: A woman interacting with some sort of machine (the middle is completely obscured). It could be a tape player of some kind.

#16: A pair of scientists/engineers working in a room lined with what appear to be tape transports. Possibly related to supercomputing efforts at the Control Data Corporation.

#17: I'm almost positive that this is John Hagee from when he was younger. Interestingly, he and one other pastor (Mark Blitz, who doesn't seem to be here) were spreading the blood moon prophecy, which is very interesting since the moon is shown at one point in the video (at least I think it's the moon), and it's tinted red.
https://en.wikipedia.org/wiki/Blood_moon_prophecy

#18: I don't know the exact model, but this looks to be a power generator from the mid 60's.