Rob asked:
"Why did humans evolve to believe in God? What is the point in this belief? Is it responsible for the upkeep of natural balance? Or is it just a temporary flaw in human evolution that is being fixed."

Humans evolved a believe in natural gods as a means of explaining the unexplainable. Go to a very remote part of the planet, find native tribes, and show them a piece of technology they can not possibly comprehend. Ask them to explain it and they will come up with an explantion. A working hypothesis. One they will stick with until it is proven invaluable or incorrect. Thus we started off with worship of sun, moon, forest, bears, etc.

The religions we see today, differ only slightly from those original religions. The difference is that politicians found it easier to control populations with a personification (god is good, devil is evil, heaven is good, hell is hellish).
So at about the time that humans moved from hunter-gather to agriculture the god(s) evolved to become more powerful control tools.

The quest of science is to replace those sun, as a god, with a superior explanation, that it is a hydrogen fusion furnace with a strong gravitational field that embraces our planet.

Never forget that the primary purpose of religion used to be explanation. As science has provided that explanation more and more religion has become nothing but a control mechanism designed to tell you what is right, what is wrong, where to spend your money, who to vote for, who you can and can not sleep with and when. The technique though has never changed: Brain washing of children.

DA Morgan