Why conflate "doubt" with "disbelief" except to obscure the real numbers for ideological reasons?
Huh? Perhaps the study had 3 options for the question on faith in God: believe, doubt, disbelieve? It really feels like you're awfully eager to be contentious.
FR really isn't the place to have a good discussion re. evolution/creationism. Information is a google search away, and we really can't get at the heart of the issue through a long-distance forum anyway. Just believe what you want to believe, and consider whether Truth exists.