Religious doubter (8)
I believe the answer is:
agnostic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">religious doubter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for agnostic that I've seen before include "Doubtful, non-committal" , "He finds it difficult to believe" , "No firm believer" , "Believing that nothing can be known about the existence of God" , "Coasting away with non-believer" .)