Does it matter if a person thinks God started the universe 13.8bn years. If they think 13.8bn years ago God started the universe with a Big Bang they could still answer in the affirmative. Isn't a negative answer basically saying I don't believe a big bang occured (no matter how it started)?
In my experience conversing with scientifically literate Christians, not putting God into the equation and the way it's worded in the poll labels them atheists. Just sayin.