The difference between theism and nontheism is not whether one does or does not believe in God... Theism is a deep-seated conviction that there's some hand to hold: if we just do the right things, someone will appreciate us and take care of us... Nontheism is relaxing with the ambiguity and uncertainty of the present moment without reaching for anything to protect ourselves.
When Things Fall Apart: Heart Advice for Difficult Times (ed. Shambhala Publications, 2000) - ISBN: 9780834821002