The antonym of atheist is theist. An atheist is someone who does not believe that god(s) exist, or that there is no reason to believe that they exist. A theist is someone who believes that god(s) exist and that there is sufficient reason to believe that they exist.
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The opposite of Atheism (disbelief in God) is theism (belief in God or gods). That's why they call it atheism (nottheism).