How can you mean anything other than "Jesus' birth defines the common era"? You can call it BC - Before Christ, or BCE - Before the Common Era, or CC - Current Calendar, or FFT - Fred Flintstone Time, but if you still call this year "2006", then you are still referencing Jesus' birth. To call it anything else is petty symantics. Your Jewish archaeoligist can use any dating system he wants, but if he calls this year 2006, he is referencing Jesus, whose only contribution to mankind is that he is the Christ of Christianity.....
Sorry, I meant to say CE defined by Jesus birth, not defines Jesus birth.