"religious beliefs ought to be irrelevant at work"
I disagree with this sentiment, and therefore the whole post. I am an atheist, but every personal characteristic is relevant at work.
If you have a staff-member who has claustrophobia, and you fire them because your office is a lightless dungeon and they are having trouble coping, this is unfair dismissal.
If you have a staff-member who has a physical disability, and you fire them because you don’t have the facilities available for them, it’s unfair dismissal.
If you have a staff-member who is religiously obligated not to drink alcohol, then your occupation shouldn’t force them to. But there is no religious obligation not to handle, or deliver alcohol – that should be taken to court and examined with the help of a Muslim scholar, if necessary, by the defence.
Ie. The employer would take the employee to disciplinary procedures, and the employee should have to prove that it is a genuine religious refusal.
The only argument against this I can see is that religion is stupid, or a moot aspect of personality, and is not the same therefore as a phobia. But I don’t see how the “friendly atheist” can make such a point. People are not equal – I have in my staff someone who is very charismatic, someone who works quietly but efficiently, a time-waster, so on. They all have their roles and need to be treated differently; anyone who tries a Communist-esque suppression of individuality is not a good employer or businessperson.
Just my $0.02.