I was lucky I suppose. I was raised in a reasonable church. It's
a methodist church in my hometown in NJ - a town with only two
churches, a protestant and a catholic. So, we went to the
Protestant one because it wasn't Catholic.
The teachings if I had to summarize, were "Do Good, Be Good, See
Good". Nothing about hell. Jesus was basically a really nice guy
to look up to as a role model. Old Testament God was seen as a
flawed interpretation, almost ignorable etc.
I was lucky because I never really met or saw anybody that fit
the Believer category til I was in my 20s. They didn't make
sense to me. The people I grew up with were doctors, engineers,
scientists, housewives, business people, etc. Well educated, no
contradiction between going to church and Big Bang or Evolution
and stuff like that.
So while I'm basically a "Go Science Yay" guy, people who
congregate reasonably about reasonable things and have
reasonable goals to improve the world - I don't care what they
believe happens when they die, so long as they're decent people
here. So for me, I couldn't be Atheist; I don't know either way
and it really doesn't matter much to me so long as people are
decent and kind, have an accurate view of history and science
etc.