Final answer:
Morocco, Iran, and Libya follow religious law, particularly Islamic law or Sharia, in their legal systems, with Iran being a well-known Islamic religious state.
Step-by-step explanation:
The three countries where religious law is followed, particularly Islamic law or Sharia, are Morocco, Iran, and Libya. These countries have legal systems heavily influenced by their religious beliefs, and Sharia plays a central role in their legal frameworks. For example, in Iran, the legal system is based on Islamic law, and the country is categorized as an Islamic religious state. Similarly, in countries like Saudi Arabia, religious doctrine significantly shapes the state's laws and civil codes. The concept of a secular state contrasts with these religious states, as secular states keep religious and civil law separate, striving to ensure religious neutrality in legal matters.