The real answer could be a lot simpler. The human mind evolved as an analytical instrument. Part of this is a system literally hardwired to create order out of seemingly unrelated items.

See something? Amazing, isn't it? The human eye and brain can integrate an astonishingly limited amount of data into a whole.

The human brain does not like chaos, and will force order onto it if left to itself. Ever look at a random pattern like wood grain, or a speckled tile floor, and start pulling faces and objects out of the patterns?

It isn't just a visual phenomenon, but a mental one as well. A random or unknowable universe really rubs the human brain the wrong way, and it's not surprising that humans will come up with concepts pulled out of thin air to support a universe based on order. This is especially true for the thousands of years before science really came into its own. If you don't know jack about electricity, it feels a lot better to think Thor is making lightning than to just leave a cognitive blank in your brain.

It's amusing how some proud atheists also promote various complex and marvelous conspiracy theories about reality that don't hold up to close examination. Same phenomenon, different outlet. Same for some secular beliefs, ranging from simple superstitions all the way up to Marxist dialectic.

Don't think there's a way to totally eliminate this urge other than by changing the parts of the brain that allow you to think and create.

But like any natural impulse or urge, it can be controlled by reason and education. Fortunately, we can do this, but it's something that needs to be done by volition, and is not as automatic as the religious impulse. An uphill battle.