Where to go if you want to be an atheist?

Answer 1

There is no temple, school or institute of Atheism. Most people who have been theists make the decision to become atheists on their own - often after a long period of questioning or introspection, but sometimes after a moment of "satori" when the choice becomes obvious.

There are many reference works, websites and clubs that can support your position, but it comes down to an individual choice.