well, this has turned into quiite an interesting thread...
so, did anything specifically gear you away from religion? like some certain people?
I think enough people have finished with your first opening question, that I need not comment on it. Other atheists have answered it in the same way I would.
As for your second post...
I think there are people who have never needed to be steered away from religious thinking. Those who were not brought up in a religious family would never have been religious. So for them there would be no outside force to pull them away from religious mentality. It would be natural for them to have no thoughts of God(s)
As for myself, I was raised by my Mother. She was religious, and therefor I did know of God growing up. I was never made to goto church, or read scripture, but I was always reminded that Jesus, and God are real and they watch over us and this and that.... The problem with my Mother being the only religious influence on me as a child, was that I knew from an early age that my Mother was also.. Uh.. different. Not quite normal. I always knew that my Mother had mental problems, and so this helped me to question her religious views.
I actually started on my path to atheism when I was about 11 or 12 years of age. I began by actually praying on my knees in the middle of my room for my Mom. Asking that she be helped, and turned away from drugs. That she would be happy. It was only a matter of time before I started to realize, nothing was happening. Nothing was changing. I felt stupid sitting in the middle of my room talking to the ceiling every night. This is what lead to my realization. It took me awhile before I would outright say, "I do not believe in God." There was a little hesitation at first. Didn't know if I would be struck by lightning or hit by a car. lol
But after a couple years I became more sure of myself. After I learned a bit more of the workings of the world and the universe. School of course helped my understanding. By the time I hit highschool I was convinced of my decision. Of course my Mother was never fond of my conversion. It is only in the past couple years that she will even acknowledge that I'm atheist. Throughout my childhood, I was not allowed to really talk to her about it. Before then she would become furious and either kick me out of the house, disown me, or refuse to discuss it. To this day I really can't express my views in her house. Not that I would want to anymore. lol
So for me, no particular person really pushed me away from God. It was just me following what I felt made the most sense. My Mother brought me to religion, and as I became older I rejected it.