I frankly can’t imagine what better reason one could need to disbelieve any claim, than a dearth of objective evidence even after thousands of years of pontification? Without indulging in semantics I wouldn’t even describe it as a position, but rather the absence of one particular position.
As with all words, it is incumbent on anyone who uses any word to specify accurately if they deviate from the primary dictionary definition, and that is the lack or absence of belief in any deity or deity.