Man, can you imagine...
You're a good mage, praised by your village for being a genius. After years of study, you decide to mount an expedition group to explore the higher levels of a dungeon.
There, you get confronted by a giant snake that wipes your party and proves how worthless you are in reality.
Then, out of nowhere, a giant spider appears, one shots the snake like nothing, heals your group with a level of magic you've never seen and then just BAMFs out after picking up the snake and an acorn.
Yeah, that wouldn't be strange if a new religion suddenly appears in the human world. Also, the mother of the actual spider is pretty much a real god. Or a demon.