[rmc]

As long as there are alternatives provided - e.g. soda or juice - it should be OK for Muslims and other non-drinkers

Yes probably.

It's all a continuum. Saying pre-req: "enjoyment of beer" is basically "No muslims". Having a lot of social functions depend on beer could be an issue. Imagine the high power workplaces of the past (and now I'm sure) where business decisions were made in the strip club, which women would feel uncomfortable in. Something like that for muslims could be consured as a weak form of sectarianism, and potentially make the employer somewhat liable.