Genuine answer: one mind and one heart at a time. With any luck, some of them become influential and the message spreads more rapidly.

Religious indoctrination is hard, because so many of them teach that indoctrinating others is a way to save them. Ultimately, however, the whole belief system is a house of cards. It takes surprisingly little to bring it down. Ask them how they know that what they believe merits their belief. It starts there.

Nominate an opposing candidate that speaks directly to the underlying issues that made scapegoating minorities attractive. (See AOC / Trump split ticket voters.)

Encourage them to educate their friends. Tell people you successfully educated your parents. You can’t change this alone, but that alone does heavy lifting in that sentence