This book analyses the relationship between state security regime changes and the right to religious freedom in the EU. It presents a comparative analysis of the impact these regime changes have had on the politics, policies and protections of religious freedom across the EU member states in the post-2001 environment. The book provides a timely investigation into the role of national legislation, the European Court of Human Rights, and societal trends in the protection of religious freedom, and in so doing demonstrates why the relationship between state security and religious freedom is one of the most socially significant challenges facing policymakers and jurists in Europe at the present time.