Being a muslim; one should know that what Quran mentioned about Jews and Christians, was based on their past relationship with Muslims and religious bond between Christians and Jews (Jesus and Moses).

Christians can be your good friends but Jews are back stabbers; look at the current affairs even today it is proved.

Jews were punished many a times due to their own mis-deeds (they even killed their messengers) and Christians are mis-leaded by Jews (long story). Hope I answered your question.