She's talking about precepts and tenets as something you believe because a holy book or a teacher tells you so. Christians say "I identify as a follower of Jesus, therefore I believe his teachings." Nobody says "I identify as a member of the atheist group, therefore I believe the atheists that there is no god." It's the absence of a belief. If you don't believe in gods and goddesses, you just don't. The atheist identification is after that, and is not what matters.