To continue, continue
I brought up not wanting someone to be the god of smithing and metalworking, teaching the tribes iron or steel.
One of my players had this idea.
I have an idea: when you're thinking of something like the smithing example, ask a question.
"Has anyone ever done this before?"
If nobody in the setting has ever worked out how to bang that piece of iron into something useful, then the Gods don't know either. After all, Gods are powered by the Belief of those that worship them, and if the worshippers couldn't possibly know how to make something out of iron, then how will the God? They may well have to learn it from other spirits - or steal it, a roleplaying task in and of itself. Hell, we haven't even invented the wheel yet.
In the Neolithic, a God of Smithing wouldn't exist yet, since humanity hasn't quite got the concept down yet. A God of Mining would know about gold, silver and copper (reasonably easy to work with) but iron isn't quite in their purview yet