ireland and the UK
Roman Catholic is Ireland's most common religion. After that it is the Church of Ireland.
Dublin and Cork.
Ireland
The second most populated City in Ireland is Belfast, with a population of approximately 268,000! The second most populated City in the Republic of Ireland is Cork with a population of approximately 190,000. Making it the third largest city in Ireland behind Belfast and Dublin respectively!
Christianity is the dominant religion in Northern Ireland. Most people in Northern Ireland are members of a Protestant church, such as Presbyterians or Anglicans, who are members of the Church of Ireland.
Catholic
I believe it's Dublin - with a current population of 496,000.
Most of the population live in Dublin, the capital city.
That depends on what is meant by "Tons of people". Ireland is not a densely populated country. There are over 4.5 million people in Ireland. Parts of Ireland are not highly populated, particularly the rural areas of the west of Ireland.
The original religion for Ireland was catholic but when the British invaded some were converted to the protestant religion. But even now the catholic religion is still the most major in the country.
1. Christianity 2. Islam 3. Nonbelievers Islam and Christianity are about to switch places.