Many visitors will be surprised to know that Armenia is not just an outcrop of Christianity in the Caucasus, but it is the first country in the world to adopt Christianity as a state religion. The king declared Christianity the state religion in 301 AD. Christianity has been uninterruptedly practiced in Armenia ever since in its own traditions. The Armenian Apostolic Church is the National Church of Armenia. Up to 97% of Armenians follow Christianity. The great majority of Armenians identify themselves as Apostolic Christians and have their own Catholicos (religious leader, like the Pope for Catholics).

The Protestant (Evangelical) Armenians are rather few in number with only one church on Nar-Dos street. Anglican (Episcopal)

Orthodox Christians currently maintain one church in Kanaker district of Yerevan. A new, large-scale, onion-domed Orthodox church is under construction at Yerevan Lake district, visible from the highway coming from the airport.

Yezidi (pagan religious and ethnic minority in Armenia) religious rituals, as most of that religion, are kept secret. So no Yezidian practice can be observed easily in Yerevan.

Muslims are a small community whose members consist mostly of the new Iranian business community in Armenia. There is currently one Mosque on Mashtots Ave.

Many Christian sects are also present in Yerevan, and they congregate in schools, sport clubs, concert halls and the like.