Persecution is not a truely Christian characteristic. It is a perversion of Christianity. I agree that the politics referred to it as being for the sake of the faith, but I would argue that generally it was at least as much about 'tribal' power-struggles - keeping 'my' lot in power....
Before we can decide the answer I think we need to define what it is to be Christian, and whether we are talking about the country as (for the lack of a better description!) an institution - or perhaps as an organic entity of its own - or whether we are talking about the behaviour of the majority of the population or the avowed religion of the majority or even the actual faith of the majority - 4 different questions I would suggest... (the last but 1 being the easiest - just look up the result of the last census!)