The Gallup is absolutely spot on in their conclusions. America is still predominantly a "Christian" nation versus other religions. That doesn't necessarily permeate within the industry I work in. Just my observation, but of course I suppose it depends on geographic location, employer, culture, etc. I am very quiet about my faith, because I know that the workplace is usually not the place for those conversations (at least where I work!) I can't see how it would be any different within a hospital setting. My wife's nurse manager and a couple other girls on her unit are also Chrisitans and to her, it is comforting to work alongside other like minded individuals. Again, much of this is dependent on other factors such as location, hospital culture, etc. For example, I have a friend who is an NP at a Catholic based hospital in the city I reside in and this is their mission statement:
We serve together in Trinity Health,
in the spirit of the Gospel,
to heal body, mind and spirit,
to improve the health of our communities
and to steward the resources entrusted to us.
She is able to have many very open conversations about Christ, with co-workers and patients. The hospital that my wife works at is much different. More diversified and less outspoken when it comes to personal beliefs.
I'm sure many Jewish, wiccan, or Muslim believers in this country absolutely feel alone in the workplace! Especially since they are of the minority. But if they happen to have an opportunity to work alongside a likeminded person, with the same beliefs, it is probably most comforting.