There is no such thing as a Christian writer. There is a writer who may write about Christian subjects, but the authenticity leaves once you title yourself a Christian writer, or Christian Company, Christian business person, Christian surfer, etc. Be a believer if you will, but let how you are, and what you have to say, shine on its own without fitting in to a title coined by humans. Once you label yourself you will subconsciously only write from a certain perspective. Especially the way modern day followers of the way use the term Christian. Just my thoughts.