This poll shows American's views toward same-sex marriage. It uses open ended questions as to why they support or don't support same-sex marriage. I think this was a wise choice by Gallup because any other form of the question would either be leading or loaded. People have their own opinions on the matter and this is the ideal way for them to express that.
It was also no surprise that those who oppose it most do so for their religion. That was not a clever headline for the report, I would think of something more shocking.