The state religion of Qatar is the strict Wahhabi version of Islam. Only Muslims are allowed to worship in public. Converting from Islam is considered apostasy and is technically a capital offence. Only 10 per cent of the population is Qatari, the rest are expatriates and migrant workers. Migrant workers often live and work in terrible conditions, and being a Christian can add to their vulnerability. Muslims who choose to become Christians risk ostracism from their communities, violence or even honour killing if their faith is discovered.