Science and the thirst for knowledge, probably.

Paradise.

Politics.
Honestly, Religion and Politics have always been 1A and 1B over what people fight and go to war for. Politics would simply become the undisputed #1.

no development imo

Some other superstition.

So, it's virtually impossible to imagine a world without it then.

government. same thing as religion

You have to keep in mind that, towards the beginning of humanity, the world itself was an absolute mystery. To early humans, stuff like rain, lightning, the seasons, the sun, etc, was totally incredible and seemingly beyond comprehension. In most cases, the creation of early gods wasn't just "Well we don't know, let's make up a story to explain it," and more "This is some shit that is totally beyond us, there must be higher powers involved." From there, a lot of it was fed by superstition; good fortune played a significant role in the survival of our earliest ancestors, and the people who survived thought it might be their gods favoring them. And when it's your survival on the line in a world you know next to nothing about, you'll keep pursuing anything that seems like it might boost your chances.

This isn't about having a lack of courage to say we're clueless; it's the mindset formed by people who were desperate to survive. It wasn't until the time of Galileo that the notion of having to prove something you say is true became popular. And even today, many people adopt similar superstitious mentalities to early humans. Sports fans will often engage in superstitions, wearing lucky jerseys or sitting in lucky poses, because their team has performed well under those circumstances in the past.

Nationalism.

We've even had religious nationalism, like in India/Pakistan.