Even the most cursory research, e.g., Wikipedia will show that the term "antiSemitic" (antisemitisch in German) was coined specifically to refer to anti-Jewish prejudice and was enthusiastically taken up for that purpose by German antiSemites.
In addition, the English language has no "powers that be", no equivalent to the Académie française. As any lexicographer will tell you, what counts is how a word is used in ordinary speech by the general public, not a technical definition, viz "gay".
This silly semantic argument is really old hat. Hatefreaks have been whipping it out with the same depressing regularity with which they use "Zionist" as a code word for "Jew".
The Liberty was attacked on purpose, brave US servicemen died because of it.
I have zero use for any Govt that would do that.
It just so happens that Israel was behind this attack, so its them i hate because of it. Had it been Germany, i would hate them equally.
I could care less what religion somebody is, but i do care about US servicemen getting killed and a foreign govt out right lying about it.