Satan created Humans using a Worm which had the ability to manipulate it's DNA to form Humans.
It is unknown whether the Worms that created the Humans had the ability to manipulate DNA on a similar level to the Worms that created Humans.
https://www.theatlantic.com/science/archive/2019/03/giant-medusavirus-hosts-turn-to-stone/585289/
That is essentially a worm. Once it came into contact to human DNA it could only be created using that human DNA, so only worm-humans and humans could reproduce, eventually the human was able to be manipulated by the Worm to form a parasite on mans head.
The Worm's new power was a new type of brain called the Human Brain, a type of brain which that could control. This was a very powerful tool, capable of modifying both sides of reality, internal and external.
The worms used this ability to get around in life by forming 'bones', which made them stronger, even though they had less intelligence than their original Humans.
If the parasite wasn't contained it could grow to become a large adult Humanoid, despite being contained in a form of human skin/ova which contained it.
In short, it can only be created using the DNA that isn't contained within it's own self, but that is contained within the human body.
If we look at the data from this worm then it is possible to estimate the DNA sequence needed to generate Humans. For unknown probability this yields a DNA sequence value of (undisclosed) for every true Human being.
They were an amalgamation of human genetics, so they're not a race per se but an imitation of their creators. The Worm created several Humanoids which did not fit the Worm's ideal mold.
Humans and Worms had a very similar DNA to each other creating a very symbiotic relationship, that symbiotic relationship did not end when the Worms began to disrupt and cause harm to Humans.
Infected, you have many abilities such as enhanced sight, strength, enhanced resistance to poison and regenerative capabilities.
The ability to walk on walls or through space which allows you to move about freely in the atmosphere without fear of danger.
Some of these abilities are even augmented by the Worms DNA, so while the Worm can walk through spaces and open doors without fear of harm, the Worm will not move through walls and therefore will not be completely safe.
The Humanoid body was changed after having the Worm implanted into it, after the Worm was removed from the body those affected by the Worm were no longer infected by the Worm's ability.
The Humans of Earth had notable characteristics such as a higher intelligence and inherent need for food and higher physical exertion, they were not sufficient to produce a sustainable army.
The Humans bred more and more Worms..