** FILE ** Iranian Christians attend Christmas Mass at St. Grigor Armenian Catholic Church in Tehran on Saturday, Dec. 25, 2010. Iran has arrested about 70 Christians since Christmas in a crackdown that demonstrates the limits of religious tolerance by Islamic leaders, who often boast they provide room for other faiths. (AP Photo/Vahid Salemi)

Photo by: Vahid Salemi

** FILE ** Iranian Christians attend Christmas Mass at St. Grigor Armenian Catholic Church in Tehran on Saturday, Dec. 25, 2010. Iran has arrested about 70 Christians since Christmas in a crackdown that demonstrates the limits of religious tolerance by Islamic leaders, who often boast they provide room for other faiths. (AP Photo/Vahid Salemi)