Antisemitism has a very specific meaning. It does not mean being against a monotheistic God such as the one believed in by Christians, Jews, and Muslims.
It means thinking that Jews are inherently evil and/or subhuman because of their ancestry.
There are Jews that believe that fundamentalist Christians are antisemitic. For example, there are Jews that believe that the organization 'Jews for Jesus' is antisemitic.
Their reasoning is that some fundamentalist Christians believe that Judaism is a feeble attempt at approximating Christianity rather than a full-fledged religion with its own history.
Some Zionists might welcome the support of fundamentalist Christians in their efforts to expand/reclaim Israeli territory or to rebuild a synagogue on the temple mount. But I imagine the Zionists view this as a sort of "deal with the devil".
Germany transitioned away from the age old Christian-Anti Semitism and converted into environmental anti-Semitism for all the reasons mentioned earlier. The very German father of Social Darwinism, Ernst Haeckel, coined the term ecology in 1866. He was the first scientist to characterize the Jews as a biological problem. He complained that they were resistant to change, and out of step with nature’s evolutionary laws ...
How are you defining "fundamentalist Christian"?
Perhaps you should actually consider watching the presentation?