If you talk to bonifide Christians the ones that are informed, they will tell you that there are two camps in the Christian community camp in regard to the Jewish people. They will tell you that the first camp is the Christians that hold the view that the Jews are G-d's Chosen People and that Jesus will come back to redeem his people Israel (the physical Israel).
The second camp, and the one that is much more prevalent is the replacement theology camp. These people believe that G-d has written off the Jewish people because our rebellion by not accepting Jesus as our Mashiach. They claim that they are now the true Israel and that when Jesus returns he will redeem them, and utterly reject physical Israel.
Now think about what has happened to every nation that has persecuted us, cast us off or murdered us. Most of them were once great powers: England, Spain, Italy (Rome), the Byzantine Empire; all of these is either a second rate power or they don't exist anymore. So, if the British people as a majority have written off us Jews as lost forever then they have cursed themselves. If the Muslims take over England, it is something that England did to themselves. Sure we regret to see this happen, but blessings are blessings and curses are curses.