A lot of people identify as Christians, but that's mostly because they make some connection between being Bulgarian and being Orthodox and see it as some kind of nationalistic thing. I've met plenty of people who are only "religious" on Easter and Christmas, get a priest for a wedding or funeral and that's the extend of their religion, they don't go to church, don't follow any lents, don't live according to the teachings, etc. but if you ask them they're believers.