Read up on EEOC regulation and you'll see your example won't fly. Exceptions must be reasonable and not cause undue hardship on the employer.
"An accommodation may cause undue hardship if it is costly, compromises workplace safety, decreases workplace efficiency, infringes on the rights of other employees, or requires other employees to unwillingly do more than their share of potentially hazardous or burdensome work." - https://www.eeoc.gov/religious-discrimination
Otherwise we would all be joining a religion which require 360 days of religious festivities each year.
"An accommodation may cause undue hardship if it is costly, compromises workplace safety, decreases workplace efficiency, infringes on the rights of other employees, or requires other employees to unwillingly do more than their share of potentially hazardous or burdensome work." - https://www.eeoc.gov/religious-discrimination
Otherwise we would all be joining a religion which require 360 days of religious festivities each year.