Reported cases of Christians killed for their faith around the world doubled in 2013 from the year before, with Syria accounting for more than the whole global total in 2012, according to an annual survey.
Open Doors, a non-denominational group supporting persecuted Christians worldwide, said on Wednesday it had documented 2,123 "martyr" killings, compared with 1,201 in 2012 .
Christianity is the largest and most widely spread faith in the world, with 2.2 billion followers, or 32 percent of the world population, according to a survey by the U.S.-based Pew Forum on religion and Public Life.
About 10 percent of Syrians are Christians.
Open Doors, which began in the 1950s smuggling Bibles into communist states and now works in more than 60 countries, estimated last year that about 100 million Christians around the world suffered persecution for their faith.
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