When I left I still believed it was all true. It was quite a few years later before I realized it was all bunk. I had taken some college classes and there was a lot of things learned that made me raise an eyebrow. When I read CoC and found out that 607/1914 is a big sham it was a huge relief and the final straw I needed.
I guess i have the WT to thank since they were always pointing out how everyone else is wrong. Well, when I found out they are wrong as well, no need to keep looking. Especially when I only see the bible as a rather lousy mythology book now.