ecumenist

/ɪˈkjuːmənɪst/
noun
  1. A person who supports or works for unity among different Christian churches or denominations.
    • As a dedicated ecumenist, she volunteered at interfaith community events.
    • Ecumenists often emphasize shared Christian values over doctrinal differences.
    • The ecumenist invited leaders from various denominations to a roundtable discussion.