1) Something, regardless of denial, is eternal
2) I am a personal being and I am not a creator. First, I am personal, I exist. I am not a rock. Evolution suggests I am a chemical reaction. Fine, in even a misconception there is a truth, I am a self-cognizant chemical reaction at the very least. While I believe this is absolutely elementary school for an explanation of me, I am the product of something eternal. This eternal substance is 'god' in the sense that it made or created me. If for nothing else, you have to recognize, we all believe in some kind of 'god' because we are not 'it' or 'him.'
3) Since we all believe in 'some' god in one form or another, it is only definition that needs further analysis. There is a 'god' plain and simple. I am the product or creation of something or someone that created me.
4) 3 kinds of doubters: Agnostics that recognizes that there is a 'god' but are not sure or don't care. Agnostics who are are not certain whether a god exists. These second ones are like the atheist. An atheist believes there is no creator. Perhaps, they would concede that they are a created being, but they just do not desire to prostrate themselves to a rock, or an impersonal process of evolution from that rock.
5) Why a personal god? I believe the complexity of our minds speaks to and from a higher order. We tend to value experience, one another, and sometimes things in a way that points to a existential perception. The world turning, or the processes of nature do not tend to bring meaning to this perception. There is a uniqueness to our existence that we cannot explain.
6) The other way around. So far I've discussed why we perceive a god. What I have not discussed however, is the perspective of a god. If a personal god exists, he/she either desires to be left alone, or desires relationship. If the god desires to be left alone, we could expect that we would have no certainty of who this god is, just a certainty that some kind or form of a creator exists, personal or otherwise. If however this god is personal, desires relationship, and wants to have some kind of relation with his creatures, we could expect that he/she would initiate this relationship somehow. The question is, has such a god done so?