Tesla, the Wizard of Colorado Springs.
Actually, the novels (and the comic book prequel "Welcome to the Jungle", which was also written by Butcher) make it out that the Ascension ritual to become a god (ala the Dark Hallow) is a pretty huge deal, requiring a massive amount of sacrifice and absorption of mystical energy to knock yourself up into that tier of power. People worshiping you isn't enough.
There are lots of Cults to demons and Wizards, but they wont make that creature a god.
Personally, I'd go with a Scion of Hephaestus, since he's basically the god of technology (You could even say that Tesla was just a guise of Hephaestus, since Changes pretty heavily implies that a lot of the old god are just slumming around Earth), by its very nature, Hephaestian Sponsored Magic would amount to, "If it was made by man, its my bitch."