It took me a much longer time than most people:
Age 12 - very suspicious after reading the Bible the first time.
Age 20 - frustrated with my inability to experience God, and decided I didn't believe.
Age 43 - had psychosis and became convinced that Christianity must be true somehow.
Age 45 - became suspicious again and stopped going to church and learning about religion.
Age 48 - atheist again (armed with more information this time)
Age 12 - very suspicious after reading the Bible the first time.
Age 20 - frustrated with my inability to experience God, and decided I didn't believe.
Age 43 - had psychosis and became convinced that Christianity must be true somehow.
Age 45 - became suspicious again and stopped going to church and learning about religion.
Age 48 - atheist again (armed with more information this time)