I know a lot of people think humanity would be leaps and bounds ahead without religion, but I think our imagination and those fables were necessary as we grew and our mental capacity increased, but our knowledge of the world remained quite limited. I think religion was a necessary consequence of our creative spirit.

Imagine a world where:
Science is advanced instead of supressed
Knowledge is held dear so things are written down and preserved instead of destroyed
Contraception is promoted instead being deemed immoral
Groups, Tribes, States, Nations and the entire civilization works toward solutions rather than assigning blame and going to war.
No Holocaust, No 9/11, No Crusades, No Witch Hunts, No Enquisition, etc., etc.

I tend to think we would be much better off.

Religion was just a step along the way. Man neede a way to explain the world around him, so he invented gods.

So, really, we'd have to assume that man went from seeing the world as chaos, to using science to give order to things. It would certainly have sped up our progress. So much of our history can be summed up as religious conflicts.

We'd probably be launching ships to the stars by now, if religion had not been invented. But that's just conjecture, more of a nice daydream than anything else.

Imagine - John Lennon

It would be more peaceful. Religion is the cause of most wars.

Fully Automated Luxury Gay Space Communism

Idk because it didn't happen.

It would be better to don`t have religion.

I honestly don't think it would have been much different than it is now. Religion has always been a way of controlling the masses to get them to do what you want them to. Basically a way to get one set of people to feel superior to another. Without religion they would have turned to other forms of control.

There are way to many variable to be able to imagine a probable outcome. A population, free of superstition may have earlier developed the scientific method and developed technology that would greatly increase the quality and longevity of human life for those that lived on the earth before our time and perhaps our ancestors understood the consequences of overpopulation and limited fossil resources and carbon dioxide loading and we could continue to benefiting from the progression of science and technology.

On the other hand, perhaps earlier generations with their machines and extended lifespans, may have by now decimated our fossil recourses leaving us in an grotesquely overpopulated and overheated (c02) world that is no longer capable of providing for an unsustainable population.

I feel like religion was the backbone of scientific discovery. If we never invented religion, likely we would still be in a tribal state hunting for ourselves and surviving to the next day. I doubt that would be a worse thing than what we have now since what we have now is kind of an upgraded version of tribal rivalry/cooperation. But it would probably be better since we’d have a lower population and wouldn’t need to be sedentary and wouldn’t have a reason to be sitting around or arguing about what’s going on with the food supply in another country like it was our business. Today, though, our problems kind of affect everyone, so why not go back to the old days? Why hinge a society only on cooperation than just making it to the next day? I say cut out the middle man.

It's beginning to look as if there wouldn't have been a civilization without religion in the broad sense. Gobekli Tepi has changed everything.

There would be no way of knowing. You may as well ask what if we reproduced by mitosis, We simply did not come that way.
There is a good book on why this is not so,
The Illusion of God’s Presence - John C. Wathey
Lecture on;

I honestly have no idea.
It's likely we wouldn't have all the art and architecture created during the Renaissance.
I don't know if anything else would have fueled the same level of creativity that religion has.
Not saying it's necessarily a "good thing", but the beauty of the art created can't be denied.

Hmm. I'm not sure it would be that different besides us reaching tech advances sooner in the pre modern era. In other words we would be where we're at now, just sooner. Religion is credited for the arts but I'm sure art would still exist in a non religious world. And though religion is the cause of a lot of suffering, I'm convinced that something would take its place. Greed. Nationalism, and basic human fuckery may be encouraged by religion, but they certainly aren't dependent on religion for their existence.

We would be colonizing space and lifespan would exceed 200

I would like to think that civilization would have reached a stage of development that will probably take at least another five hundred years to arrive at. Even if all religions vanished tomorrow there would be something equally absurd, if not more so, to replace them.

As others have said here, I believe we would be seeing much more advanced tech/science. People would be able to think more clearly and rationally without the psychological poison of religion. Surely, there will always be good & bad people in the world, but no religion would be a net positive. That goes to a large extent to governments as well.

Extreme anarchy, or technologically advanced.

Did you ever wonder if it was not "invented" by our ancestors but created by those "aliens" you crave so much and want so bad to see now?

It will psychologically be similar to the jarua tribe of andman nicobar island,who do not believe in religion and they have no diety.

I don’t know if THAT is even possible - we go from IGNORANCE with its superstition that “progresses” into religion and then SCIENCE.

But there are societies that don’t just ‘reject’ god belief, but never had one and are simply ATHEIST - having always be without “A”, Godism “theism”...

You can investigate THOSE societies and postulate from there. But it takes GODISM/RELIGION to want to conquer the world, so we HAD to deal with those things...

How would we know?

Something akin to Star Trek TNG or equivalent.
It's not bad that we invented it, per se, it's bad that we stuck with it during and after the Renaissance