" Even in America this is a problem. In the summer of 2011, Middle East Quarterly published the results of an intensive four-year study on “sharia-adherence and the promotion of violent, jihadist literature in U.S. mosques.”14 The results? A stunning 81 percent carried jihad hate literature—with 51 percent carrying texts “rated as severely advocating violence,” and 30 percent carrying texts “rated as moderately advocating violence.”15 Especially disturbing was the discovery that “mosques with this literature were not merely repositories but incubators for the messaging of this material.”16 And fully 58 percent of the mosques “invited guest imams known to promote violent jihad.”17 "

― Erwin W. Lutzer , The Cross in the Shadow of the Crescent: An Informed Response to Islam’s War with Christianity