You say that because so many people have believed in the same overall god concept, it should hold some credibility to God's existence.
I see something opposite of what you are seeing. I see that it must be a trait of humans to question why we have a conscience, and why we are here. I think all of the religions are around the world because they are a great way to control a population. At least, thats why I think they are still around. But to answer your question, I think that humans carry a similar hunger to understand this whole life experience thing. In my opinion, when we thought these God concepts up, we were all still too dumb to know the answer. And now that time has passed, we can answer these questions smarter than, "A magic man in the sky made it."