I think he is speaking to all the bombing that has taken place in London and Paris (and other European cities). Strongholds was way overstated. I think thats what he means. They have trouble with Islamic extremists bombing night clubs etc... and have for a while. But I think he forgets that London had just as many bombings by Christians (Catholic extremists from Ireland, the IRA). Although I get the cutting feeling he does not consider Catholics real Christians. In that case I would have him go back in time and visit Northern Ireland and the Protestant terrorist groups.