The verbal attacks and boycott calls by a variety of Western Protestant, mainly liberal, denominations, as well as the World Council of Churches, have raised new interest in the origins of Christian anti-Semitism and in particular its Protestant version.
Among the Protestants' founding fathers, Martin Luther was particularly anti-Semitic. His writings were precursors of twentieth-century National Socialist texts. Adolf Hitler, Joseph Goebbels, and Julius Streicher gladly quoted from Luther's works.
In the current anti-Israel positions of liberal Western churches, nontheological influences are probably more important.
Churches have taught antipathy to Jews for two thousand years. It is mistaken to think this can be overturned in a few decades. The new expressions of Christian hatred toward Israel reflect deep psychological processes.