Almost one in five Americans believe that Barack Obama is a Muslim, according to a new poll, despite his public statements about his Christian faith.

The survey by the Pew Research Centre found that 18% now say that the US president 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. Forty three percent say they do not know Obama's religion.

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