can't do that..they'll sue for discrimination and will continue to push the boundaries until they'll only touch islamic approved foods and by extension only the foods you can buy..dhimmitude is well on it's way unless someone with some brass ones grabs hold of the situation..IMHO
The clear and concise way to handle it is to challenge them to take you to court. In the end if all our rights to run a profitable business are taken away, the worst hit organization in our country will be the government - no tax revenue.
See Haliburton for further reference.
No discrimination. You must be able to fulfill the essential functions of your job. If you are a clerk then scanning pork would be an essential part of that job description. Fire her.