Read other letters about this article
I would say that anyone who believes Sen. Obama is a Muslim actually hasn't actually looked it up. So it's not a matter of dismissing good Google information, it's a matter of going directly to sites that support your point of view and either hearing wrong information or not hearing information that contradicts the perception.
This article on Keith Ellison, the first Muslim congressman, illustrates the point: http://www.foxnews.com/story/0,2933,233983,00.html