Why for Israel?

A general overview of the two parts of our Bible course:

Catholics for Israel is an apostolate faithful to the Magisterium, the living teaching office of the Church to whom Jesus has entrusted the task of authentically interpreting the word of God (DV 10).  This means that official magisterial teachings of the Catholic Church, most especially chapter 4 of the declaration Nostra Aetate and the Catechism of the Catholic Church, form the core of our beliefs concerning Israel and the Jewish people. 

Why is there a need for an apostolate of Catholics for Israel? What are some of the current challenges and problems in the Church and in the world that Catholics for Israel hopes to address?