A survey from the Pew Research Center finds nearly one out of five respondents incorrectly believe President Barack Obama is a Muslim, with a higher percentage among Republicans.

The survey states:

A substantial and growing number of Americans say that Barack Obama is a Muslim, while the proportion saying he is a Christian has declined. More than a year and a half into his presidency, a plurality of the public says they do not know what religion Obama follows.

A new national survey by the Pew Research Center finds that nearly one-in-five Americans (18%) now say Obama is a Muslim, up from 11% in March 2009. Only about one-third of adults (34%) say Obama is a Christian, down sharply from 48% in 2009. Fully 43% say they do not know what Obama's religion is. The survey was completed in early August, before Obama's recent comments about the proposed construction of a mosque near the site of the former World Trade Center.

The view that Obama is a Muslim is more widespread among his political opponents than among his backers. Roughly a third of conservative Republicans (34%) say Obama is a Muslim, as do 30% of those who disapprove of Obama's job performance. But even among many of his supporters and allies, less than half now say Obama is a Christian. Among Democrats, for instance, 46% say Obama is a Christian, down from 55% in March 2009.