Secular writers can tell a story about the physical, the emotional, and the intellectual parts of a character. But no matter how well they tell the story, they miss a facet that is innately part of all of us - the spiritual.
I don't practice, but I am still officially in paediatrics. I keep in touch with journals, and I have a very good data bank of medical information and there is a key thing for a writer knowing where to go. I know where to go to get the information that I need.