Since I was about 13.
Prior to that I was an agnostic. From the very beginning, for as long as I can remember, the whole Jesus trip just didn't make sense to me, it's not the way I would have set things up if I was God. As a kid I thought maybe there was some kind of God, even if not the one the grown-ups talked about, but before long I realized that was not really an explanation, it was just a way to avoid the question.