What is the main problem besides religion in northern Ireland and Ireland?

There is no such thing as "northern Ireland." There is Northern Ireland and the Republic of Ireland. The main problems besides religion in Northern Ireland and the Republic of Ireland are:

- The economy. Both countries have relatively high levels of unemployment and poverty, and the economies of both countries have been struggling in recent years.

- The political system. The political system in Northern Ireland is highly divided along religious lines, and it can be difficult to build consensus on important issues.

- Social problems. Both countries have high levels of social problems, such as crime, drug use, and mental health issues.

- The legacy of the conflict. The conflict in Northern Ireland lasted for decades, and it left behind a legacy of bitterness and division.