::I can maybe see "Christian Era", because at least that accurately and honestly describes it for what it really is, i.e. an Era used by Christians (who historically and traditionally have always preferred to call it AD).  If you ask me, you'd think it would sound much more offensive, insensitive and incorrect to take an era blatantly used by Christians, and proclaim that to be "Common Era" for the whole world  even the non Christian countries, who might otherwise date their eras from some other event.  But go figure.