That assumes much and proves nothing. The theistic worldview has many explanations for why some people would choose not to believe in God (desire for freedom from cosmic authority, stubborn skepticism, being lied to and convinced by people who have already rejected belief in God, etc.). The belief or disbelief of someone does not prove or disprove anything, because people can always be wrong. Beliefs are judged by their adherence to logic, reason, and evidence, not by who holds them