By now, Sekou Jackson is used to the questions: Why does he need to leave a work meeting to pray? Don't black Muslims convert to Islam in jail? Why would you even want to be Muslim? "It's kind of a double whammy to be African-American and Muslim," said Jackson, who studies the Navy at the National Academy of Science in Washington. "You're going to be judged." Jackson's struggle may have gotten harder when the FBI raided a Detroit mosque Wednesday, saying its leader preached hate against the government, trafficked in stolen goods and belonged to a radical group that wants...