There is a new series on the Pharyngula blog: Posts confessing “Why I Am An Atheist” gleaned from comments and responses. Some are well written, others not so much. But each is selected for showing a particular path into the light for people who have recovered from invisible friend addiction.
The most recent post, Why I am an atheist – Adam, shows how an upbringing under the Ken Ham school of Young Earth Creation and science denialism eventually led him to an understanding of the willful ignorance and dishonesty that pervades that culture. Once he began to question the “facts” that he was raised with, he quickly climbed up toward rationalism and lost his religion.