Infundibulum, I don't agree with MAY. If people choose religion, or choose to change their religion, clearly they have been previously exposed in some way to religion, otherwise they wouldn't be aware of its existence in the first place.
Everton, yes, it is a choice to believe, but unlike atheism, religion is imposed on us from childhood, which is why at age 11 you tried to engage with God. Your teachers never told you God doesn't exist, did they - hence you sang hymns and sought knowledge of other religions - and the pigeonhole you are in is one of your choosing. Atheists don't belong to any club, and whilst some may be guilty of intellectual laziness, I would say that most who contribute to these pages, and choose in adult life to read authors like Richard Dawkins actively seek the truth, and are, therefore, not among them.