There were times when no social conspiracies could have existed. Where we were advanced animals, hunting, mating, howling. Even then, something inside us made us search for more, and believe for more. It began by worshipping the sun, or the fire, or the lightning, or the wind, or the earth... Long before supposed leaders were trying to figure out methods to drive their minions over their enemies.
The truth, and the way we interpret it, is not always the same thing. In fact, maybe it rarely is. There are answers that only one can give himself/herself, such as if he/she is in love, and he/she believes in a superior creator. So basically you listen, read what is told, analyse it, observe things for yourself, mix them with your own feelings and your experiences, and come to a result. As long as this is between you and you, it doesn't matter what you believe in. Things only get screwed up when you try to impose this belief to someone else for war, money, asimilation etc. which has been done millions of time, which has nothing to do with the truth itself. (whatever it is.) So maybe you don't believe in god. Ok. Just don't scream "jesus!" or "oh my god" when you see a lightning striking a man a few meters ahead of you and survive without harm. Just stay calm and express the situation like "interesting coincidance, dude..." and keep walking.
Believing in something greater, a creator is maybe the result of looking into oneself, maybe. One tends to believe he/she has a much greater potential inside him/her somehow, the feeling of being a part of something much more greater. Being parted, or being given life from something. This helps you when you are alone in the dark and an unseen enemy is stalking you, or when you are a pilot and lose two engines at the same time with 200 passengers behind, or when you are a scientist at chernobyl and alarms go wild. Again, how you interpret this feeling is not neccesarily the truth. You may sit calmly and say "whatever god wishes, is going to happen" and let the plant blow up, or "my god, give me power to save these people!" and land the plane on water sliding, without harm to anyone.
Basically, when we were not so much dependent on our technology and society, we were a much more spiritual race. It is undeniable; life is something magical. But being sentient... if you are careful at analysing, you can notice that an evolution pyhsically can be easily explained, but an evolution of mind is not the same thing.
Answer to presence of god? Well.. who cares except you? What if your neighbour believes in sun, or goats, or flies, or toilet pumps. as long as this is between him and him, that is. When you cross this line, no matter what, it is no longer religion, or a belief. It is a fight.