None were Christian, or perhaps they just don't like to tell people what religion, if any, they practice. In todays world, it could be dangerous to tell someone you're a Christian. I lived in Korea for 7 years, and while I didn't go around asking people their religious preference, you could see by going to their homes, that they were Christians, by pictures they may have had hanging, or a cross in the home. My wifes entire family practice Christianity. They were'nt raised with it, but I guess when the parents died, or the girls married, they switched.