Now that you mention it, I don't.
Personally, I would have gone with "Do you believe in natural selection[?]".
Also you need to add something to make it clear that you are quoting. I.e. quotation marks.
"Personally, I would have gone with "Do you believe in natural selection[?]"".
Good for you, you're not me.
"Also you need to add something to make it clear that you are quoting. I.e. quotation marks".
Nothing I wrote that wasn't in inverted commas needed to be in inverted commas, Professor.