|Anti-Judaism is mainly an American fantasy|
Not so. Many holy Fathers of the Church have written treatises against Judaism and the Jews over nearly the last 2,000 years. All Christians ought to oppose current expressions of Judaism because they are antichrist and all of them set themselves in opposition to Christ and His Holy Church.
Christianity in Europe is much more of a culture, a moral attitude than a religion.
Precisely why it is not Christianity you are describing, but apostasy from Christianity. I trust you can recognize the difference.