IPA: /θiˈoʊlədʒən/
KK: /θiˈoʊlədʒən/
A person who studies or specializes in religious beliefs and practices.
The theologian gave a lecture on the importance of faith in modern society.
The word 'theologian' is formed from 'theo-' (from Greek 'theos', meaning god) and '-logian' (from Greek 'logia', meaning study or discourse). A theologian is someone who studies or discusses the nature of God and religious beliefs.
Think of 'theo' meaning god and 'logia' meaning study — a theologian is someone who studies about God.