“A rising number of Americans — nearly one-in-five — incorrectly believe Barack Obama is a Muslim.”
“Fully 31% [of Republicans] say Obama is Muslim, up 14 points from March 2009. An additional 39% of Republicans say they do not know Obama’s religion, up 11 points from March 2009.” [That’s 70% of Republicans.]
“Most Americans (60%) who claim Obama is a Muslim say they learned about his religion via the media.”
If we put this together with the Pew Religion survey, I think that we can safely conclude that, though many people think our President is a Muslim, they also think that Muslims believe in transubstantion, plural marriage, and Santa Claus.