You seem to want to whittle gods down to 'beings that create stuff'. I think that's not enough to define a god because then computer programmers, novelists, et al, are "gods". Soon the topic is going to be "so what's NOT a god??"
Well I do think there is a grey area - and that things could be called "god-like" rather than definitely be gods. BTW there are "God games":
en.wikipedia.org
an artificial life game that casts the player in the position of controlling the game on a large scale, as an entity with divine and supernatural powers, as a great leader, or with no specified character (as in Spore), and places them in charge of a game setting containing autonomous characters to guard and influence.
In some of those games, like "Black and White", the player is a god who is worshipped.
And, also... WAS there a Greek or Roman god that wasn't worshiped by at least some persons in those cultures?
About Greek gods:
en.wikipedia.org
Types and numbers of gods/goddesses:
Major gods and goddesses - 14
Primordial deities (Protogenos) - 21
Titans and Titanesses - The Twelve Titans - 12, Other Titans - 16
Sea deities - dozens
Sky deities - dozens
Agricultural deities - 11 (including demi-gods)
Health deities - 10
Sleep deities - 6
Other deities - dozens
Perhaps at least one of those 100 or so gods/goddesses hasn't been worshipped.... and in early Greek history that would definitely be the case. Also Greeks would believe that other gods exist such as some of those from other cultures.
Acts 17:23 talks about the gods of the Greeks and says
For as I walked around and looked carefully at your objects of worship, I even found an altar with this inscription: to an unknown god. So you are ignorant of the very thing you worship—and this is what I am going to proclaim to you.
So the Greeks believed that gods that they weren't aware of existed - and if you're not aware of something you can't properly worship it.
Isn't being descriptive of what the believers do with their contrived idea, "god", the thing that matters when defining a "god"?
I think the Greeks would believe that there are gods that they (and other cultures) aren't necessarily aware of....
Or are you ignoring reality and doing a thought experiment so that you can force your "non-obvious god" idea to work?
The Futurama episode is one of the only things I'm aware of that is relevant to my non-obvious intelligent force belief - and things like "don't put God to the test"....
I think the creator of Futurama is an agnostic and the essence of the non-obvious god idea is that you can't really be sure it exists.... or at least you can't convince skeptics of its reality....