http://www.christianitytoday.com/ct/2006/november/37.32.html
Mark R. Elliot, editor of East-West Church and Ministry Report, estimates that between 1997 and 2003 the revocations of visas of foreign religious workers totaled 84. Fifty-four of them were Protestants, 15 Muslims, 7 Catholics, 3 Buddhists, 3 Mormons, and 2 Jehovah's Witnesses. And these are just the known cases; most are not reported.
I think that the numbers are very telling.