Interesting point.
Coming back to Poseidon as well.
Googling images, most are modern representations of the “devil with a pitchfork” but most of the time they are 3 prong and do look more like tridents. Probably were tridents originally.
I am sure over time there was confusion and misinterpretation.
I would note that in Christianity at least, Jesus is a Fisher of Men. Clearly, a fisherman might use a trident to spear fish, or in this case people/souls.
Thus his adversary a.k.a. “Satan” [i](which is a title or description. NOT A NAME–it literally means ‘adversary’ so when thousands of people in the middle east call the US, the Great Satan, they mean the Great Adversary–they aren’t necessarily saying the US is the devil…although of course, some may mean that given they know what people in the US think it means)[/i] would like use a trident to “fish men’s souls” be they could be saved.