Northern Ireland and the Republic of Ireland have different currencies.
In the Republic of Ireland the currency used is the Euro and in Northern Ireland the currency used is the Pound Sterling.
Nollaig Shona Dhuit is Merry Christmas in Irish Gaelic, which is still taught in schools in Eire, the Irish Republic. Northern Ireland is part of the United Kingdom. Christmas in Ireland is a traditional holiday in both parts of the island, and very much a family and religious celebration!
The predominant religion in Ireland is Christianity, with the largest church being the Roman Catholic Church. Ireland's constitution states that the state may not endorse any particular religion and guarantees freedom of religion.