“Jews won’t replace us” makes no sense, on top of that. We have very little Jewish immigration to the US, and in fact, some are leaving because of the left’s hostility to Jews.
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If you watch some of the alt right YT videos and especially read the comments, they believe Jews are the cause of the invasion of Muslims, Mexicans and Africans. Among all sorts of other nefarious schemes to destroy the USA.
Most of them are lefties who push for drowning us in foreign cultures, but Jewish people comprise only a very small portion of those who do so. There are far more Catholics and Protestants on the radical left than Jewish people.