I wouldn’t let this guy slip the label of racist on a technicality about racial categories. He apparently has a problem with people of a certain skin color. That’s good enough for the label to fit. No mercy for these people.
The guy is not racist, he is religionist. I’ve met plenty of people who identify as “white” who are as dark, if not darker, than him. He wants to be racist, but his racism is directed at people of his own race.
What needs to happen is for every religionist like him to have their face rubbed in the fact that we are the same race.