- The furries were artificially created. This one is also obvious, as it was showed in a flashback.
- Jack, Jill and Central — among others — are part of the "first batch" of furries. As showed in the same flashback, they had no reproductive organs, for obvious reasons.
- Somewhen after the obvious question was raised: What Measure Is a Non-Human?? This leads to many — or several — lawsuits, discussion and general outcry. Apparently, though, the furries lost in the whole process, and, morally speaking, things remained as they were.
- Kane was the one that, secretly, started the creation of furries with sexual organs. His motivations quite probably led him to be stablished as the representative of "Envy", and this might explain why the heck he is in Furry Hell being a human.
- It was revealed Kane had created, while alive, a body transferring machine. It might be as simple as he used an artificial body that was close enough to what the furries are to get sent to furry hell., with a side of karma.
- And somewhen after all that Jack went on a killing spree for some reason — probably involving Jill's death, or may I say, execution — and killed all humans. All of them. Whether he killed himself — and maybe Central — afterwards, Pro-Mole is not very sure.
- I think it is going along the lines of Some well meaning human introduced Jack to the concept of God and religion, and that got him thinking his creators as gods. As they created his race. Jill dies, accident, unstable version, disease, whatever. Jack begs the "gods" to fix her. After all, they are God. They can't. So after much angst and possible relationship with Central Jack pulls an Aizen, says there is no God so he'll be God, and begins massacring the false gods, i.e. humans.
- Mentioned canonically as Jack overhearing a guard at the facility talking to a scared loved one on the phone and telling her that god would be there to keep her safe. Jack later asked one of the scientists what god was and he explained the idea of god. Since the scientists-especially Kane had called themselves gods Jack either believed them to be gods, or were simply challenging them with the "If you all are supposed to be gods why can't you bring Jill back to life!?" Thus the oft echoed line of "What kind of gods are you!?"
- I think it is going along the lines of Some well meaning human introduced Jack to the concept of God and religion, and that got him thinking his creators as gods. As they created his race. Jill dies, accident, unstable version, disease, whatever. Jack begs the "gods" to fix her. After all, they are God. They can't. So after much angst and possible relationship with Central Jack pulls an Aizen, says there is no God so he'll be God, and begins massacring the false gods, i.e. humans.
- Also, all humans, with an obvious exception, went to Heaven. That's why we didn't see them anymore, we don't get to see Heaven that often do we?
- Or alternatively, there's a different part of each afterlife just for humans.
- Or there are several billion humans in hell, but by now so much time has elapsed since the creation of furries that their souls outnumber the humans so hevily humanity is a tiny, invisable minority in the afterlife with the one exeption of Kane.
- According to the comic, humans destroyed the world, and God had to do a hard reset on the universe.
- Or rather, a hard reset of history, making sure things are more or less the same in certain aspects up until humanity's chronological high score is broken.
- The "hard reset" of the universe by god also ensured that history would take the same basic course.
Both this theory and the above one help to explain the obvious holes in Hopkins' universe caused by an attempt to hammer together a plot from a bunch of arcs written with no preplanning. Hopefully, he'll throw us some explanation, someday, but for now it seems we have a long time to wait...
Simply put. The real reason is the artist says he can't draw humans well. In story, they reincarnated as furies. Then died again. All save 2.
And in an alternate universe. When the Great Old Ones awoke and began to annihilate everything, one of the Elder Gods (God) created a hidden universe of their own. After spending thousands of years in darkness, either from mourning or fear of discovery, God creates the angels, and then gets the suggestion of creating a world. But after creation, God discovers that one of C'thulhu's Star Spawn ("Friggin Clithu Elder God") entered the universe at its creation, and is attempting to alert the mighty Old Ones. In a panic, God arranges the rebellion of angels to justify the creation of Hell, which is actually harvesting suffering to imprison the Star Spawn and keep its memories suppressed.
- Humans were created first, and followed their own path as God let them. When they created the furries and then set the earth back to the stone age, God manipulated the furries into following the paths of the humans from the original universe, just for old time's sake.
- God must have exaggerated the damage Her presence would do to mortals. Elder Gods don't tend to kill you by being near them.
- Explained away in "sever the anger" with whats either a Handwave or Fridge Brilliance When Jack earned his place in hell by wipping out humanity, it did so much damage to God's plan for the universe God had to reset history and start over from scratch with furries, regardless of the damage to the timeline. God's attempts to get history back on the same track as before explains the furry Sampson, the WW! and veitnam veterens, and the fact furries died in thier own version of 9/11.
Once upon a time, the wings of angels weren't feathered, but insectoid.
- Despite what you might think, God never forgot her original creation. She changed her form to match the newest incarnation of her progeny, yes... but she never did change her eyes.
Even with most of her body sealed up in a wall, even with Drip being the embodiment of Lust, she can still cow him with a handful of words. Eventually she's going to become a power-behind-the-throne type, and she'll either be content with simply owning her grandson for eternity... or she'll usurp him.
Based on what little is revealed about Dalton from his titular arc, we know that he has severe headaches and appears to be very mentally unhinged, causing him to lash out in violent rages. Knowing that Satan is also willing to make him the new Sin of Wrath should Jack try life again, and taking what he said about "not interfering with somebody's timeline" into account, it could be safe to assume that Dalton's headaches and violent psychosis are the symptoms of a severe and likely-fatal brain tumor. He's probably still a complete psychopath regardless considering his callous disregard for anyone's suffering and his utter lack of remorse, but his disease would only serve to exacerbate an already-serious problem.
There's no reason for God to be in the form of a sheep; God made man in His image, right? So even with all these furries running around, God should still be human. Nope. Sheep-God was Envy in Hell, but since time is funny in Hell, she was able to usurp God's position when humanity was wiped out and then move the pieces around fourth-dimensionally as needed. Unable to actually rule the universe, she just copy-pasted human history onto furry history, and forced the real God to incarnate as a human in the hopes of having him made subject to the natural cycles of life and death. It worked: Kane, being driven to create life, created furries, which eventually caused the Furpocalypse (for lack of a better word) and Envy was already waiting to work her new plan when he died and went to Hell. She made him the new Envy and took his place.
That's why the afterlife is so badly mismanaged: an agent of Hell is controlling everything.