Not God, but gods, sure. I was basically atheist for most of my childhood, though I find it more accurate to refer to that decade or so of my life as "angstheism." You know, the "atheists" who throw a temper tantrum against the religion and theism of their upbringing and then conclude that all theism and all religion is stupid in one fell swoop? Yeah, I was that guy at one time. Urgh.
I grew out of it when I bothered to learn about theism and religion on my own time. Nobody converted me, and I don't really regard the process as a conversion. I was ignorant and had been doing things religious all my life but didn't label them that because "ew, religion is stupid" mentality. Same thing with the notion of gods.