A Wal-Mart store manager who is a Seventh-day Adventist sued the company on religious discrimination grounds, claiming he was demoted for his observance of the Sabbath.
"Plaintiff Gordon Fields filed his suit against Wal-Mart in the U.S. District Court for the Eastern District of Pennsylvania, alleging that his employer, which previously accommodated his inability to work Friday evenings and Saturdays, rescinded that accommodation and issued him an ultimatum.
As a Seventh-day Adventist, Gordon observes a period of rest from sundown Friday to sundown Saturday. While Gordon was originally allowed to take off on the Sabbath, according to his complaint, a new human resources manager told him that the company could no longer allow that for a manager, and he would either have to work on the Sabbath or be demoted in order to maintain his religious accommodation."
--Read the whole Legal Intelligencier Article
Cases like this one are surprisingly common. Those that I have recently handled had a fact pattern similar to this case: an employer refusing to honor a holy day mandated by and employee's religion despite the fact that it would be a trivial matter for the company to do so.