The Pew Forum on Religion and Public Life projects the world’s Muslim population will increase by about 35% in the next 20 years, to more than 2 billion; the number of Muslims in the United States is set to more than double, from two and a half million in 2010 to more than 6 million in 2030.
via:[http://pewforum.org/The-Future-of-the-Global-Muslim-Population.aspx]