co-religionist

• coreligionist

From co- +‎ religionist.

• (UK) IPA^(key): /kəʊɹɪˈlɪdʒənɪst/

co-religionist (plural co-religionists)

1. A fellow follower of one's religion.
   • 2009, Diarmaid MacCulloch, A History of Christianity, Penguin 2010, p. 499:

     From the mid-sixteenth century, Western Christians – Protestants as well as Roman Catholics, thanks to the great split of the Reformation – interested themselves afresh in their afflicted co-religionists in the East.

• co-religionary