I would not want to judge and dismiss anyone so easily and readily. Especially since I am not acquainted with anyone who is either. If someone is a nationalist they can still be religious. I guess unless the "religion" you subscribe to is "globalism". If someone is white they can still be religious. Despite what some people may think. Some people may not choose to accept that Jesus was a Jew, and that Christianity comes directly from Judaism, but history and revelation tell us otherwise. Those people who reject Judaism because Jesus was persecuted by the Jewish hierarchy don't seem to get it that Jesus had to die to atone for our sins - an Old Testament sacrifice which becomes the basis for Christianity. So in accepting Jesus yes they are Christian although rejecting His background seems very disingenuous. And for anyone to be consistently "anti-Semitic" wouldn't they have to reject the other Semitic peoples as well?
But when we get into hatred really there is no rhyme or reason. Once people decide to hate and put so many of their energies into so doing they not only diminish the objects of their hatred but themselves as well.