1. Rejecting any belief in gods
   - atheistic, atheistical 
2. Holding that only material phenomena can be known and knowledge of spiritual matters or ultimate causes is impossible
   - nescient 
3. Denying or questioning the tenets of especially a religion
   - disbelieving, skeptical [N. Amer], sceptical [Brit, Cdn]

See also: agnostic, agnostical, incredulous, irreligious

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