What is clear is the EEOC's lawsuit is a straight-forward application of employment law. Employers, employees, and the Courts are often stymied by the precise definition of reasonable accommodations. Like ADA litigation, a plaintiff's success hinges on whether the Court views the accommodations that the employee requested as "reasonable" and whether the employer's refusal, therefore, brings upon liability.
In this case, without additional information, it appears that the employers failed to make simple accommodations to avoid creating a very serious religious issue.