A Celtic Cross is the symbol of the Church of Ireland.
The Church of Ireland belongs to the Anglican Communion, a world wide grouping of self-governing churches, including the Church of England. In Scotland and the United States, members are known as Episcopalians.
The Christian Bible is the key holy book of the Church, which shares the principal beliefs of other traditions of Christianity.
Clergy are usually called priests or deacons. Those in charge of parishes are usually described as rectors.