I don't believe we have that word, unless you use something like heretic ( a professed believer who maintains religious opinions contrary to those accepted by his or her church or rejects doctrines prescribed by that church) or recusant (one who refuses to obey the authority of the church) . We have these: atheist - someone who believes that *** does not exist agnostic - someone who believes that it is not possible to know whether *** exists or not
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