I'll be honest edgar, I haven't per se talked to anyone who has come out and stated they thought he was muslim. maybe because I'm in a liberal city. people who have said things like "I just don't trust him" and can't answer the question when asked why.."I don't know, there's just something about him" have been white, and mostly of the bible thumping, extremely conservative ilk.
I could be wrong, but I'm still guessing that's a stronger belief in rural areas.
If they did come out and say that, when not with their fellow believers, they'd at least get a blank look, like "WTF?"
BTW, when I looked up that article on line, I saw the people polled where registered voters, just thought I'd add that to the story.
Meaning they are citizens. So any people who were born in another country have passed a test, which means a certain level of education.