The idea is that a merging of all peoples into one will trigger the advent of the anti Christ. I look to Judaism, which has taught me similar principles in terms of separateness. God created the universe by separating the earth from the sky, the land from the seas, man from animals, woman from man, the Jewish people from the other nations, and the Sabbath from other days. As a youth, I attended United Synagogue Youth socials, which were set up for the purpose of encouraging dating between young Jewish men and woman. This did not imply an anti gentile position.
Many organizations accept for membership people based on race, ethnicity, religion etc.
This is a right and doesn't necessarily imply anti anyone else. The Congressional Black Caucus prefers Black Congressman. Smith College prefers women, Howard University prefers Blacks. To suggest that these organizations are racist or discriminatory would be ludicrous. Naturally, most religions consider their doctrine to be true and therefore, to varying degrees, other doctrines to be false.