I volunteered at a Centura hospital for just under a year, and loved it although I am not religious. In fact, I started volunteering there because I had been so impressed with the staff when I was a patient there a couple of years ago. I cannot speak for all Centura hospitals but this one is definitely.. different (in a very good way). Something about the staff attitude stands out from any other hospital I experienced. I have heard similar feedback about Centura hospitals from others. Regarding the religious affiliation, I have never been asked about my religion and although Centura is open about its religious foundation, religion was never a topic on the floors.
Hope that helps.