They generally do not. Most employers will ask questions pertaining to food or coffee once the person is hired and they are having food brought in for everyone. They ask if anyone has any food restrictions or if they cannot eat certain things for relifgious reasons.
It's illegal for a potential employer, with the exception being a church, to ask you "religious stuff" during an interview.
Well I had religion brought up on me twice this week. Monday interviewer mentioned my attending Bob Jones and he said what he thought about BJU and their legalism. Then the interviewer today brought up religion. At first he said I was "overqualified" for the job and thought I might be one to be arrogant and all. However he said that once he saw my "christian background" he decided to call me in for a interview. It may be illegal but it happens everyday!