I was an atheist from a very young age. I don't think I ever was religious as I was brought up in a Church of England way in Lancashire in the 1960's (born in 1961) which was not at all "devout". I remember asking my Dad who this "Devil" that we were told about at school was and he explained in a humorous way, as my younger brother helped himself to a biscuit out of the tin that we were not allowed in, but he was toddling and still to young to speak or understand, that the Devil was making him do it. I am 2 yrs older than my brother so I'm not sure how old I was exactly but I must have been quite young. This confirmed my suspicion that religion was a load of BS especially when a few short years later man went to the moon and didn't report anyone sitting on a cloud surrounded by angels.
I changed my mind sometime in my 20's after reading about quantum physics and the possibility of other dimensions. Although I can't claim to understand it fully it really does fascinate me. This coupled with reading about people who have had near death experiences has convinced me that we do live on as spiritual beings elsewhere after we die. I am still non religious though so I think the best description of me would be a pantheist or panentheist. I guess we'll never know for sure until we get there. Or not.