Religion and Discrimination

An applicant applies for a job in a hair salon.  The owner states up front that one of the job duties is for the worker to show off her own hair-do.  The applicant holds a religious belief that she must keep her hair covered in public.  The owner says, sorry, but it's a job requirement and if you're unprepared to perform the duty then you're not qualified for the job.  The applicant then files a lawsuit for religious discrimination.  (link to story) 
 
Several cases have arisen recently where pharmacy workers have refused to fill birth control prescriptions because their religion opposes birth control.  In most cases, another worker is available to take over and fill the prescription.  But what if another worker were unavailable?  Would the pharmacy be justified in firing the employee for nonperformance of duties?
 
Some grocery stores sell wine and beer.  Is a cash-register person whose religion opposes booze consumption justified in refusing to deal with a customer who wants to buy some?
 
Suppose a job (police officer, hotel desk clerk, airline reservation agent) requires a uniform which conflicts in some way with a religiously mandated item of clothing.  Is the employer required to make a special exception for that one employee?
 
I think that if you can't or won't perform the job duties, for whatever reason, religion or otherwise, then you're unqualified for the job and have no business applying for in the first place. If you really want the job, then change your religion.
 
As soon as a few religious leaders start realizing that their strange doctrines render True Believers unqualified to get jobs, maybe they'll start receiving mystic revelations from God to change these doctrines.  Strange things like that have happened in history, you know.