If there were no atheists?

[robvalue]

If there were no atheists, that would probably mean that there is no need to even have that word anymore, since humanity has grown out of the "God" superstition.

I know that's not what you meant though. Acting in a sceptical, scientific fashion is how progress is made. If no one did this, and there were no atheists, I imagine we'd be in a very primitive society ruled by superstition. It's a lot easier being scientific as an irreligious atheist I imagine, because you don't have to "put aside" religious doctrines while you work.