On walking home from school aged 16 I experienced my Eureka moment - God is manmade, not the other way around. This realisation gave me a great feeling of relief but also fear that I did not believe in God, contrary to the norm. Other than discussions with my husband [an atheist] I kept my beliefs pretty much to myself until last year when - by chance - I read The Ancestors Tale by Richard Dawkins. I then read The Selfish Gene followed by The Blind Watchmaker, and then I ordered The God Delusion.
At 52 I now have the absolute confidence to be an atheist and to tell anyone that cares to know. Since coming out, I have discovered that most of the people I know are either atheists or wavering agnostics! Thank you Prof Dawkins.