Synonyms of freethinker
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agnosticAn agnostic believes that it is not possible to know whether God exists or not. Compare atheist.
• He was, if not an atheist, an agnostic.
doubterIf you refer to people as doubters, you mean that they have doubts about something, especially their religious or political system.
• Doubters fear this may not be good news.
infidelIf one person refers to another as an infidel, the first person is hostile towards the second person because that person has a different religion or has no religion.
• a holy war to drive the infidels out
Thesaurus for freethinker from the Collins English Thesaurus