What if co-workers complain about an employee being granted an accommodation?

Although religious accommodations that infringe on co-workers’ ability to perform their duties or subject co-workers to a hostile work environment will generally constitute undue hardship, general disgruntlement, resentment, or jealousy of co-workers will not.  Undue hardship requires more than proof that some co-workers complained; a showing of undue hardship based on co-worker interests generally requires evidence that the accommodation would actually infringe on the rights of co-workers or cause disruption of work.