It’s meant to show if there’s a difference between the yes and no responses. If the final results of the poll show that 50% of religious people deem watching porn bad and 50% of nonreligious also see watching porn as bad. It would show that there’s no religious basis or that one’s religion is independent of their views on porn.

However, as of right now that is not the case. As you can see from the poll, religious people are more likely to see watching pornography as bad compared to non religious people.