The Catholic church could allow the traditional observation of Friday abstinence on Mondays, making this a religious observance in the schools.
Play their game.
That wouldn’t make sense.
“The Friday Fast is an Eastern Orthodox, Roman Catholic, and Anglican practice of abstaining from meat on Fridays.
According to Pope Peter of Alexandria, the Friday fast is done in commemoration of the crucifixion of Jesus Christ on Good Friday.
Abstinence is colloquially referred to as “fasting” although it does not necessarily involve a reduction in the quantity of food.”
Source: Wikipedia