Given the vast amount of gods in the various mythologies, would it be possible to make our own patrons?
I have no idea how long homebrew will take to trickle down to Scion, but there homebrew stuff is in progress. They’re making as much of it as cross-Nexus-compatible as they can, but a lot of the details are Nexus specific. Given those details, I think it is safe to assume that we will have the ability to Homebrew Pantheons or at least Gods and Goddesses.
Total Speculation:
I believe the first Nexus to get Homebrew will be Daggerheart (as there has been a “behind the scenes” demo of that over in the Discord.) Given the overall popularity of PF2 and tangentially SF2, I excpet that the Paizo Nexuses will be after Daggerheart. And eventually it will trickle down to Scion.