There are actually about 1,200,000 Muslims in the Uinted States, about 300,000 of whom are converts from the African-American culture. It is imnpossible that there are twice as many Muslims as Episcopalians, when I've never even seen a mosque anywhere.
That's why it also stupid for out culture to slowly commit suicude by trying to appease such a small group by suppressing normal expressions of Judeo-Christian heritage.
Come to NC to any of the major cities, you won't have to go far to find a mosque.