I think the answer is a tad more complex than, fear.
We are as we are, clearly we have an unquenchable need and desire to extract some kind of reality from abstraction, and I'm not so sure that we can blame, or even suggest that evolution has the capacity to invent God. Evolution does not give a rats ass about the suffering or existence of any creature and it never produces excess, or at least the kind of intellectual excess we see with humans. It would be easier for evolution to have make us purely instinctual, to put a lid on human intellect. I also doubt that evolution can produce human consciousness. It has however produced a being with the concomitant physical abilities to utilise our degree of consciousness.
Humans emerged utterly embedded in myth, metaphor, story, imagination and abstract thoughts and concepts right from when we first recognise began to look human. It may be that in our future, when we are less primitive than we are now, that we might gain some control over this fantastical aspect of our being.
That will not eliminate some form of God, or cause any setbacks in sciences quest to serve, WHY?
As for fear, people climb mountains, jump out of planes, race in things and test themselves in the most dangerous ways out of a love of fear.
