"God" here was the stand-in for "Dog" during the Casino Royale segment of Fallout: New Pegas. He was intended as a parody of the classic "omg my oc is like totally an alicorn but all black with red eyes and bat wings and SUCH a hunk" — but I had to come up with a reason for his existence, so I tied it in with the canon FOE/Fallout problem the Super Mutants/Alicorns had to deal with.

Namely, they're all sterile, so they're doomed to extinction unless they can figure out a way to replicate that doesn't just involve "dipping" regular humans/ponies in FEV/Taint. "God" here is the result of Trixie ("The Goddess", FOE's stand-in for Fallout's "The Master") deliberately creating a male Alicorn for breeding purposes.

Of course, that effort failed spectacularly, because Trixie was infamously shallow, hyper-focused on the idea of a boy-toy rather than a functional breeding specimen. So "God" turned out not only sterile, but also a cannibal, immediately killing and partially devouring several other Alicorns before he could be restrained. He is the only Alicorn to have been both physically and psychically ejected from the Alicorn Unity.

Until he meets Cherry "Deadshot" Pie in the Casino Royale complex, he has been aimlessly roaming the wastelands in search of a personal identity, tormented by the realization of the unethical nature of his very existence.

So yeah, he gets the classic OP Alicorn OC tragic backstory too -:D