As someone with a background in history at a secular university as well as a Christian seminary I have lived between two worlds. I noticed a recent article on the use of CE (e.g., Common Era) versus AD (i.e., Anno Domini, Latin for “in the year of our Lord”) in regard to describing the dates of historical events. Scot McKnight also mentioned this issue on his popular blog and I was asked this same question by the parent of a teenager after her son was instructed to use BCE/CE in all of his papers at a local public school.
In my undergraduate training it was clear that I was to strive for objectivity. Though I am a Christian and cannot divorce my personal faith and worldview from my historical inquiry, it would be inappropriate to advocate a particular faith position in my writing. I must attempt to understand my biases and, to the best of my ability, allow the evidence to lead me to appropriate conclusions. Though the legacy of Christianity is still implicit in the BCE/CE dating system (what do you think we are counting from?), it is less overt in its advocacy of Christianity. It is no more accurate to say 40 CE than 40 AD. However, CE claims no reference to faith and, therefore, is more appropriate for a pluralistic environment.
There is nothing Biblical about counting from the point of Jesus’ inaccurately dated birth. We don’t even want to get started on trying to date from the point of creation (settle down you young-earthers).