He works in a mixed environment in a non-Muslim country; should he leave it and take unemployment benefit or carry on working there?

No File Exists
Check below answers in case you are looking for other related questions:
Ruling on working for a Christian who makes fun of Islam
Is it permissible to work as a bus driver of a bus carrying advertisements for haraam things?

No File Exists
Related Answers:
Doing Hajj with money he earned by working in a company that produces tobacco
Working in a call centre belonging to a riba-based institution
Working as a lawyer in the Islamic judicial system
Ruling on working for a Christian who makes fun of Islam
Is it permissible to work as a bus driver of a bus carrying advertisements for haraam things?

Recommended answers for you:
Will the prayers of one who drinks alcohol not be accepted for forty days?
Is it better to fast on Mondays and Thursdays or on three days of each month?
Celebrating the night of the Isra’ and Mi’raaj
Visiting the sick – some etiquettes
Ruling on marrying cousins