- One who is filled with excessive enthusiasm in religious matters - Fanatic
- One who is not sure about God's existence - Agnostic
- One who sneers at the beliefs of others - Cynic
- A person who acts against religion - Heretic
- Having religious beliefs that do not belong to any of the main world religions - Pagan
- writing or speaking about God in a way that shows a lack of respect - Blasphemy