Religious freedom inclues the rights for heresy, ecclecticism, apostasy, atheism and breaching the religious decrees. Religious authorities usually violate these rights. Clerics usually have the most and laymen and laywomen have the least religious freedom in religious societies.
Majid Mohamadi wrote an article in Persian called Religious freedom. Here you read a brief of what he wrote. If you are interested in this subject, you may contact him at majidmohammadi at hotmail dot com.