While scorn is in order - the wording of the statement might have a big effect here. The statement is "Evolutionary theories should be taught in science lessons in schools together with other possible perspectives, such as intelligent design and creationism."
If it had been worded as "Evolutionary theories should be taught in science lessons in schools together with unevidenced screeds of long debunked perspectives, such as intelligent design and creationism." - I'd imagine a different response rate. A better guage might have been the statement
"Inteligent design has proven itself as a suitably evidenced scientific theory that should be taught in science class."
But hey - what do I know about good surveying