They don't even need to offend the god before their path to power is cut off. Their path can be cut off just because the god of craft doesn't like them.
This problem has eased now that there are two gods in the pathway. It has given machinist two options. If one god doesn't want to help them, another god will.
The appearance of the god of steam has introduced competition and have made monopoly of power by the god of craft disappear. But the presence of two gods in the pathway also means that there is conflict and division in the pathway.
It is one thing for him to invent something as an outsider. Whatever he does will benefit both of the gods, and he will receive his benefits as someone outside of the rules of the pathway.
But once he becomes a machinist, he will have to cater to the whims of one or both gods. If he doesn't, he won't grow stronger, and he risks being killed.