When the Jews are dead or too difficult to kill, Christian become the main target.
It's called divide and conquer. It's the most basic of tactics. Liberals love to apply to against conservatives, but never imagine someone would use it against them.
The Muslims have been working this racket since the 7th C. Call it a sick form of triangulation. They count on a certain latent reservoir of anti-Jewish thought within Christianity. This gives them, I suppose, a certain amount of cover as they act against all infidels.
After all, the new slaves they take in the Sudan are hardly Jews. In Kosovo, the KLA attacks synagogues and monasteries with equal fervor. Throughout the Muslim world, Christian and Jew were both in dhimmi status, and adroitly worked one against the other.
I wish our Scandinavian friends the best of luck in dealing with their new neighbors. It's one invitation that will soon prove to have been better unsent.