The existence of the second doesn't imply that the answer to first is no, merely that there is a reasonable chance some anons would answer no to the first, and thus a follow up question would be required.
I doubt even Q is in a position to provide literal proof of a Metaphysical Satan, so they would have to address skeptics as well as believers.
The two questions taken together essentially say: "Whether or not your think Satan exists, if all these people are obsessed with and serve the concept, does it really matter?"