"You will know them by their fruits."
It’s tough to find an applicable equivalent to this refusal. Comparing it to Jackie Robinson breaking the color barrier for major league baseball wouldn’t be accurate, because that was in 1947, and Beitar Jerusalem’s racist, unspoken policy still exists to this day. The club signed two Chechen Muslim players, Gabriel Kadiev and Zaur Sadayev, for the 2012-13 season. As The Guardian documented in 2015, La Familia reacted poorly. After the signings, two fans were arrested and charged when they allegedly set fire to the club’s headquarters. Others heckled the Muslims in practice and when Sadayev scored his first goal in a game, a number of supporters walked out.