noun
A person who is opposed to belief in the existence of a god or gods
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The antitheist argued against the existence of any deity during the debate.
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My friend is a hardcore antitheist and never misses a chance to criticize religion.
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I don't want to hang out with that antitheist, he's always bashing on people's beliefs.
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Her belief in science is so strong, it's like she's an antitheist towards any form of spirituality.