Considering that the term racist comes from the root word, "race", you owuld think that racism would naturally have something to do with a persons race, not the nationality (we have many nationalities in the USA), culture (although race many times has a decided bearing on race since people of the same race tend to try to huddle together), class (People of all races can be accepted into the same class, not caste), or religon (Religons will accept people of all races).
anti-semitism is not necessarily hatred of Jews.
A "semite" is defined by the dictionary as,
1. a member of any of various ancient and modern peoples originating in southwestern Asia, including the Akkadians, Canaanites, Phoenicians, Hebrews, and Arabs.
2. a Jew.
3. a member of any of the peoples descended from Shem, the eldest son of Noah.
So a jewish anti-semite could be harboring a hatred of arabic people, not jewish people.
"Then any professed Christian is automatically an autoracist."
No.
If a man identifies himself as a Christian to indicate what his beliefs are, that is not autoracism.
If a man joins a church, or any other organization, because he believes he benefits from it, that is not autoracism.
If a man does either of these, and finds either his identity or self worth in those things, rather then in what he really is, that is autoracism. Obviously a sincere Christian is one because he thinks he's better for being one than not, because it is his belief. That is not autoracism. If he thinks he gains some kind of privilege or social status from that, it would be autoracism. The same applies to belonging to a church.
Hank
The term "anti-Semitism" was coined in 19th century Germany by a Jew-hater, who wanted a more "scientific" term than "Jew hatred." It was meant originally, and is still understood today, to mean the hatred of Jews, not of Arabs or other semitic peoples.
"Considering that the term racist comes from the root word, "race", you owuld think that racism would naturally have something to do with a persons race ..."
You might, and some people make that point, but I think you are pressing the etymology of these words too much. "Racism," is used today for all irrational prejudice or evaluation of people by their identification with a group or class. Language evolves, not always the way we like.
Technically, many "Jews" today are not "sons of Shem." Sammy Davis Jr. was a Jew. (Supposedly, he would have been a son of Ham.) A similar confusion is made about Arabs and Muslims. Most muslims are not Arabs. The largest Muslim country in the world is Indonesia (Southeast Asian/Chinese mix). Most Arabs in the US are Christains.
I know, it's very confusing.
Hank