but this is not an incorrect use of “racism”.

Israeli Citizenship is determined solely by religion. The only reason that a Palestinian can't be an Israeli citizen is they haven't converted to Judaism. That's religious discrimination.

https://en.m.wikipedia.org/wiki/Israeli_citizenship_law#:~:text=Every%20Jew%20has%20the%20unrestricted,one%20parent%20is%20a%20citizen.

Otherwise you'd also have to classify the Protestant vs Catholic wars in Europe as racist too.