I have no objection to this year being numbered 2016. As you say, we have to start somewhere, and the birth of a man revered for centuries in the countries which use this system is as good a place as anywhere, particularly as it is so well established. However, in the current world, one in which Christians are a minority group, albeit a very large and influential one, I am not happy about AD and, now that I have started to think about it, CE also has problems. Perhaps the easiest thing of all would be to use plus and minus signs. Thus 55 BC(E) becomes -55, and 1453 AD/CE becomes +1453. As with AD/CE the plus sign could be dropped unless considered necessary. We'd soon become used to, for example, The Romans left Britain in the +5th century.