The study warns that Christians suffer greater hostility across the world than any other religious group.

And it claims politicians have been “blind” to the extent of violence faced by Christians in Africa, Asia and the Middle East.

The most common threat to Christians abroad is militant Islam, it says, claiming that oppression in Muslim countries is often ignored because of a fear that criticism will be seen as “racism”.

It warns that converts from Islam face being killed in Saudi Arabia, Mauritania and Iran and risk severe legal penalties in other countries across the Middle East.