The report of the American Soufan Group, which provides strategic security intelligence services to governments and multinational organisations, says that there are around 2,500 fighters from Western countries fighting for ISIS mostly with ages 18-19 who go straight to the front lines without having any military training.
The foreign fighters are taking part in these wars with the justification of fulfilling their duty in protecting their religion by helping the organisation they empathize with and in protecting the people with whom they share the same religion, the report states.
Christians, Jews and Muslims are among the 130 Austrians who went to Syria and Iraq to fight, and 20 were killed, according to official statements.
At least 30 European Christians have gone to Iraq and Syria to fight against ISIS.